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Abstract
Objective
This examine aimed to research 12-month adjustments in consuming behaviors and metabolic outcomes following bariatric surgical procedure or lifestyle-induced weight reduction.
Methods
This examine is a longitudinal secondary evaluation evaluating information from two impartial potential cohorts: bariatric surgical procedure (n = 19) and lifestyle-induced weight reduction intervention (n = 19). Body weight, physique composition (Dual-energy X-ray absorptiometer – DEXA), and metabolic parameters (blood samples, Oral Glucose Tolerance take a look at – OGTT) had been measured, and consuming behaviors had been assessed utilizing validated questionnaires (Three-Factor Eating Questionnaire, Dutch Eating Behavior Questionnaire, Binge-Eating Scale) at baseline, at 5–6 months, and at 12 months after the intervention initiation.
Results
Bariatric surgical procedure produced larger weight reduction (surgical procedure −28.1 ± 8.1 kg vs way of life −8.9 ± 7.9 kg; p < 0.001) and bigger enhancements in metabolic markers than lifestyle-induced weight reduction. Despite these variations, eating-behavior trajectories diverged. Bariatric surgical procedure was from baseline to 12 months related to steady or decreased consuming restraint, whereas lifestyle-induced weight reduction led to a rise in restraint (cognitive restraint: surgical procedure −0.05 ± 0.7 vs way of life +6.4 ± 0.9; p < 0.001; restrained consuming: surgical procedure −0.7 ± 0.1 vs way of life +0.6 ± 0.2; p < 0.001). Both interventions lowered disinhibited consuming, binge consuming, and exterior consuming. Hunger-related outcomes additionally improved in each interventions, however with completely different signatures: surgical procedure was accompanied by lowered starvation notion and cue-reactivity, whereas lifestyle-induced weight reduction was characterised by elevated reliance on deliberate cognitive/behavioral management methods. When adjustments in consuming behaviors had been analyzed per 1% physique weight misplaced, the opposing sample in restraint remained important, and the life-style group confirmed a bigger enhance in restraint and a larger relative discount in susceptibility to starvation in contrast with surgical procedure. Exploratory item-level patterns supported these profiles, suggesting fewer cue-driven triggers to overeat after surgical procedure and larger use of acutely aware restraint methods after lifestyle-induced weight reduction.
Conclusions
Lifestyle-induced weight reduction was related to elevated cognitive restraint, whereas bariatric surgical procedure resulted in steady or decreased restraint. Both interventions decreased starvation sensations, doubtless by means of adaptive studying within the way of life group and physiological adjustments after surgical procedure.
Citation: Vuorela L, Berntzen BJ, Muniandy M, Saarinen T, Meriläinen S, Koivukangas V, et al. (2026) Opposing patterns in consuming behaviors following bariatric surgical procedure versus lifestyle-induced weight reduction. PLoS One 21(4):
e0346240.
https://doi.org/10.1371/journal.pone.0346240
Editor: Valeria Guglielmi, University of Rome Tor Vergata: Universita degli Studi di Roma Tor Vergata, ITALY
Received: November 6, 2025; Accepted: March 16, 2026; Published: April 27, 2026
Copyright: © 2026 Vuorela et al. This is an open entry article distributed beneath the phrases of the Creative Commons Attribution License, which allows unrestricted use, distribution, and copy in any medium, offered the unique creator and supply are credited.
Data Availability: The information underlying this text embody delicate private information and can’t be made publicly obtainable, as public deposition would breach the accepted examine protocol and relevant information safety necessities (EU General Data Protection Regulation and nationwide laws). The dataset incorporates detailed scientific and phenotypic variables from a comparatively small cohort, such that the chance of re-identification stays non-negligible even after pseudonymisation. Accordingly, the individual-level information can’t be deposited in a public repository or offered as unrestricted supplementary recordsdata. De-identified individual-level information will be made obtainable to certified researchers for functions of verification or reuse, topic to approval by the info controller on the University of Helsinki and execution of an applicable information entry/information processing settlement between establishments. Requests ought to be directed to Helsinki University Hospital Research Lawyers: HUS Legal Counsel (analysis), PL 100, 00029 HUS | Hallintokeskus, Stenbäckinkatu 9, Helsinki, Finland. [email protected]. The information sharing includes a regular materials switch settlement.
Funding: This examine was supported by the Academy of Finland (KHP: 272376, 266286, 314383, 335443, 369181; AJ: 314457; and SH: 338417 and 338417), the Finnish Medical Foundation (SH, KHP, AJ and LV), the Finnish Diabetes Research Foundation (SH and KHP), the Orion Research Foundation (SH, LV), the Novo Nordisk Foundation (SH: NNF23SA0083953 and NNF25OC0100827; KHP: NNF10OC1013354, NNF17OC0027232, NNF20OC0060547, NNF25SA0103783, NNF24OC0091683), the Paulo Foundation (SH, KHP), the Gyllenberg Foundation (KHP), the Sigrid Juselius Foundation (KHP), the Paavo Nurmi Foundation (SH), Helsinki University Hospital Research Funds (SH, KHP, and AJ), the Jalmari and Rauha Ahokas Foundation (KHP), the Finnish Foundation for Cardiovascular Research (KHP), Government Research Funds (SH, KHP), and the University of Helsinki (KHP). The funders had no position in planning the examine design, information assortment and evaluation, the choice to publish, or the preparation of the manuscript. There was no extra exterior funding acquired for this examine.
Competing pursuits: The authors haven’t any conflicts of curiosity to declare.
Introduction
Obesity is a power, relapsing illness related to problems comparable to sort 2 diabetes (T2D), heart problems, and numerous cancers [1]. Despite remedy advances, reaching and sustaining weight reduction stays a significant problem.
Long-term weight reduction outcomes differ drastically between intervention strategies [2]. Bariatric surgical procedure ends in important and sustained weight reduction, lowered cardiovascular threat, remission of T2D, and improved high quality of life [3,4]. While way of life interventions additionally yield metabolic advantages, they often produce much less weight reduction and are related to poor long-term upkeep and frequent weight regain [5].
Bariatric surgical procedure and lifestyle-induced weight reduction have an effect on physiology otherwise, influencing meals consumption regulation [6,7]. Surgery promotes sustained weight reduction by means of mechanisms that improve satiety, scale back urge for food and starvation [8–10], and facilitate psychological adjustments in consuming habits, comparable to decreased motivation to eat [9], and lowered need to eat high-calorie treats [11–14]. Individuals present process bariatric surgical procedure additionally appear to raised management their needs [15,16]. In distinction, findings relating to consuming habits following lifestyle-induced weight reduction are inconsistent. Studies have reported will increase [17,18], no adjustments [19], or decreases [20–22] in starvation and hunger-driven consuming following way of life interventions, relying on the method. Unlike bariatric surgical procedure, lifestyle-induced weight reduction typically requires extra acutely aware, sustained efforts to limit meals consumption and regulate consuming behaviors [22,23].
Few research have instantly in contrast adjustments in consuming habits following bariatric surgical procedure versus lifestyle-induced weight reduction. One comparative examine discovered that surgical procedure lowered starvation, urge for food, and the hassle wanted to cease consuming [24]. Even when urge for food decreased equally after each interventions [25], the need to eat and potential meals consumption declined extra after surgical procedure. To date, solely two research have evaluated adjustments in consuming behaviors utilizing validated questionnaires to instantly examine bariatric surgical procedure and lifestyle-induced weight reduction [26,27]. At 11 weeks, hedonic starvation decreased equally after a comparable weight reduction in each teams, though reductions in meals reward throughout classes had been larger following surgical procedure [26]. Reductions in emotional consuming, starvation, disinhibition and meals reward together with will increase in consuming restraint and sustained weight reduction, had been noticed as much as one 12 months after bariatric surgical procedure, whereas individuals within the lifestyle-induced weight reduction group skilled weight regain and no long-term enhancements in consuming behaviors [27].
Therefore, the goal of this examine was to establish key variations in consuming habits adjustments between bariatric surgical procedure and lifestyle-induced weight reduction, utilizing validated questionnaires and a one-year follow-up. This examine evaluates each interventions utilizing standardized, multidimensional assessments and uniquely adjusts for weight reduction to raised isolate behavioral adjustments. Factors underlying these adjustments are explored by means of subscale evaluation and qualitative analysis of particular person questionnaire gadgets.
Methods
Participants
This is a secondary, comparative, longitudinal evaluation of two impartial potential cohorts with harmonized assessments. We included adults with out sort 2 diabetes who had full eating-behavior questionnaire information obtainable at baseline and at 12-month follow-up.
Bariatric surgical procedure cohort.
The father or mother bariatric surgical procedure cohort (n = 120) has been beforehand printed) [28]. At 12 months, 112 individuals remained with full follow-up (one deliberate gastric bypass was transformed to sleeve gastrectomy, three had been misplaced to follow-up, and 4 didn’t return questionnaires). For the current comparative evaluation, we chosen a subset of 19 individuals with out diabetes whose baseline physique mass index and intercourse distribution had been most akin to the life-style cohort. These individuals (14 girls/5 males; age 47.0 ± 9.2 years; baseline physique mass index >35 kg/m²) underwent Roux-en-Y gastric bypass (n = 7) or one-anastomosis gastric bypass (n = 12). Key exclusions included anemia (hemoglobin <120 g/L), being pregnant/lactation, contraindications to magnetic resonance imaging/spectroscopy, hiatal hernia, reflux esophagitis or Barrett’s esophagus, and different circumstances affecting security or interpretation.
Lifestyle cohort.
Nineteen adults with weight problems (12 girls/ 7 males; age 35.8 ± 7.7 years) accomplished a life-style weight-loss trial, had no concomitant medicines, and had full follow-up [29–31]. Exclusions included smoking, > 5 kg weight change within the prior 3 months, diabetes, endocrine illness, or medicines affecting urge for food or weight regulation; no individuals had been misplaced to follow-up.
Participants had been recruited at Helsinki University Central Hospital and Oulu University Hospital (surgical procedure) and the University of Helsinki Obesity Research Unit (way of life). Ethics approvals had been HUS 1/13/03/02/16 (surgical procedure) and 270/13/03/01/08 (way of life); trials had been registered at ClinicalTrials.gov (NCT02882685; NCT01312090). All individuals gave written knowledgeable consent.
Study design
Both cohorts had been adopted for 12 months with repeated measures of consuming behaviors, anthropometry/physique composition, and metabolic outcomes.
Surgery timeline.
Baseline was at first of a 6-week very-low-calorie weight loss program (800–1000 kcal/day), ~ 6 weeks pre-surgery; follow-ups occurred at 6 and 12 months post-surgery. Subsequently, individuals acquired dietary and train counseling tailored to postsurgical wants [28].
Lifestyle timeline.
Assessments had been at baseline, 5 months, and 12 months. The program started with a 6-week very-low-calorie weight loss program, adopted by counseling for a 500–1000 kcal/day deficit with common dietitian/nurse visits (twice month-to-month to month 5, then month-to-month) [29–31].
Although not designed as a head-to-head trial, the same follow-up construction and similar eating-behavior questionnaires enabled longitudinal comparability of behavioral trajectories between interventions.
Clinical examinations
Body weight and peak had been measured in gentle clothes after an in a single day quick, and physique mass index (BMI, kg/m2) was calculated. Body composition was measured by dual-energy x-ray absorptiometry (DEXA; GE Lunar Prodigy). Fasting plasma glucose was measured following a 12-hour quick utilizing spectrophotometric hexokinase and glucose-6-phosphate dehydrogenase assay (Roche Diagnostics), and insulin resistance estimated utilizing the homeostatic mannequin evaluation for insulin resistance (HOMA-IR) index. Fasting plasma complete ldl cholesterol, HDL ldl cholesterol, and triglycerides had been measured utilizing enzymatic strategies (Roche Diagnostics Hitachi, Hitachi Ltd) and LDL ldl cholesterol was calculated utilizing the Friedewald formulation.
Questionnaires
Eating behaviors had been assessed utilizing validated questionnaires: (i) the Three-Factor Eating Questionnaire (TFEQ), (ii) the Dutch Eating Behavior Questionnaire (DEBQ), and (iii) the Binge-Eating Scale (BES; Table 1). The TFEQ measured cognitive restraint of consuming (acutely aware restriction of meals consumption), disinhibited consuming (overeating in response to social, emotional, or food-related triggers), and susceptibility to starvation (Table 1) [32]. The TFEQ subscales included: versatile and inflexible management [33]; recurring, emotional, and situational susceptibility to disinhibition [34]; and inner and exterior locus of starvation [34]. The DEBQ assessed restrained, exterior, and emotional consuming [35]. The BES evaluated the severity of binge-eating habits [36]. Participants accomplished the Finnish variations of the questionnaires. Responses had been scored primarily based on questionnaires’ directions. In the uncommon prevalence that individuals gave two solutions for a single merchandise, the typical was recorded. Outcome variables had been included if not less than 80% of things had been accomplished. In the surgical procedure group, one DEBQ merchandise (Question 22: “Do you have a desire to eat when you are emotionally upset?”), was lacking by default and handled as a lacking response. Additionally, we performed a qualitative evaluation by deciding on particular person gadgets per questionnaire that confirmed extra distinguished adjustments (primarily based on p values and worth shifts) between baseline and 12-month follow-up. We chosen ten gadgets from TFEQ and DEBQ, and 5 from BES, to facilitate a extra descriptive dialogue.
Statistical strategies
Statistical analyses had been performed utilizing Stata (launch 17.0, Stata Corporation, College Station, TX, USA) and R (R Foundation for Statistical Computing, Vienna, Austria). Between- and within-group variations in final result variables from baseline to five–6 and 12 months had been analyzed utilizing linear mixed-effects fashions with restricted most probability estimation. The fashions included group, time and their interplay as fastened results, in addition to intercourse, age, baseline BMI, and baseline final result worth to account for baseline variations between teams. Participant identifiers had been included as random results. Residuals had been assessed for normality utilizing the Shapiro–Wilk take a look at and by visible inspection of quantile–quantile (QQ) plots and histograms. Variables had been log10-transformed if residual distribution violated normality assumptions. Baseline between-group variations had been assessed utilizing separate linear blended fashions, with group-and-time interplay as fastened and participant id’s as random results. Chi-square take a look at was used to evaluate baseline intercourse variations. To account for variations in weight reduction between teams, we investigated behavioral adjustments relative to weight reduction share. Linear mixed-effects regression fashions had been used to judge adjustments in standardized consuming behaviors per 1% of weight reduction from baseline to 12 months, adjusted for intercourse and age. In this evaluation the consuming habits variables had been moreover standardized (imply = 0, SD = 1) to facilitate comparisons. Post hoc comparisons had been carried out utilizing The Tukey HSD take a look at. Individual questionnaire gadgets had been in contrast between baseline and at 12 months utilizing the McNemar symmetry take a look at for dependent variables. All statistical take a look at had been two-tailed, and significance was set at p < 0.05. Because the examine pattern measurement was decided by feasibility, submit hoc impact measurement estimates and energy calculations had been used to contextualize the detectable between-group variations in consuming habits trajectories. Effect measurement was quantified as Cohen’s d for the between-group distinction in change from baseline to the ultimate follow-up timepoint, comparable to the group × time interplay estimate from the linear mixed-effects fashions. Post hoc energy was calculated utilizing G*Power with the take a look at household t checks (two-tailed) “Means: Difference between two independent means,” utilizing α = 0.05 and group pattern sizes of n = 19 every. Under these circumstances, a standardized impact measurement of roughly Cohen’s d = 0.95 is required to realize 80% energy, indicating that the examine was primarily powered to detect giant between-group variations in behavioral change. Given the sturdy conceptual relatedness amongst consuming behaviors and the emphasis on estimation of behavioral trajectories moderately than binary speculation testing, no formal correction for a number of comparisons was utilized. Effect measurement estimates and corresponding energy calculations for all consuming habits outcomes are reported within the Supporting Information to permit interpretation of impact magnitude and uncertainty throughout behaviors (S1 Table).
Results
Greater metabolic enhancements following bariatric surgical procedure in comparison with lifestyle-induced weight reduction
At baseline, bariatric surgical procedure individuals had a better BMI (38.6 ± 2.5 vs. 34.6 ± 2.7; p < 0.001) in addition to increased weight, age, and HOMA-index however decrease HbA1c ranges in comparison with the lifestyle-induced weight reduction group. No different important variations had been noticed between the teams (Fig 1, Table 2, S2 Table). None of the individuals had sort 2 diabetes. By 5–6 months, the bariatric surgical procedure group confirmed larger reductions in weight, BMI, physique fats, in addition to bigger enhancements in glucose metabolism, together with Hba1c and HOMA-index, in comparison with the life-style group. These variations persevered at 12 months, with surgical procedure individuals additionally exhibiting extra pronounced enhancements in lipid profile by increased decreases in complete and LDL-cholesterol ranges. At 12 months, the bariatric surgical procedure group had achieved a complete weight lack of 28.1 ± 8.1 kg (25.1 ± 7.2%), considerably larger than the 8.9 ± 7.9 kg (9.0 ± 7.4%) misplaced within the lifestyle-induced weight reduction group (p < 0.001). Although each teams had the same baseline physique fats share (~44%), the surgical procedure group had a ten.5% decrease physique fats share than the life-style group at 12 months (Fig 1, Table 2, S2 Table).
Fig 1. Anthropometric and metabolic characteristics in bariatric surgery- versus lifestyle-induced weight loss interventions at baseline and at 5 months for the dieting group and 6 months for the bariatric surgery group and 12 months.
The p-values for comparisons between surgery and dieting interventions are shown as asterisks between the surgery and dieting data points at each timepoint. The p-values for the within-group change from baseline to 12 months is shown behind the final data point of the dieting and surgery group separately. *p < 0.05,**p < 0.01***, p < 0.001. Abbreviations: BMI, body mass index; HOMA-IR, homeostatic model assessment for insulin resistance; LDL, low-density lipoprotein; HDL, high-density lipoprotein.
Increased cognitive restraint following lifestyle-induced weight reduction, lowered disinhibited consuming following bariatric surgical procedure, and decreased susceptibility to starvation in TFEQ following each interventions
First, we assessed consuming behaviors utilizing the TFEQ. At baseline, cognitive restraint of consuming was increased in bariatric surgical procedure than lifestyle-induced weight reduction individuals (Fig 2, Table 3, S3 Table). During weight reduction, cognitive restraint considerably elevated at each 6 and 12 months within the lifestyle-induced weight reduction group however remained unchanged in bariatric surgical procedure individuals, leading to important between-group variations at each timepoints. Disinhibited consuming, additionally comparable at baseline, decreased in each teams, although the discount was extra pronounced within the bariatric surgical procedure group over the 12-month interval. At baseline, each lifestyle-induced group reported increased ranges of susceptibility to starvation. However, individuals within the lifestyle-induced weight reduction group confirmed a larger discount in the course of the first 6 months in contrast with these within the bariatric surgical procedure group. By 12 months, susceptibility to starvation had considerably declined in each teams, with no important between-group variations (Fig 2, Table 3, S3 Table).
Fig 2. Eating behaviors in bariatric surgery- versus lifestyle-induced weight loss interventions at baseline and at 5 months for the dieting group and 6 months for the bariatric surgery group and 12 months.
The primary variables in the graphs are colored black and the subscale graphs are colored grey. The p-values for the comparisons between surgery and dieting are shown as asterisks between the data points at each timepoint. The p-values for the within-group change from baseline to 12 months are shown behind the final data point of the dieting and surgery group separately. *p < 0.05, **p < 0.01, ***p < 0.001. Abbreviations: TFEQ, Three-Factor Eating Questionnaire; DEBQ, Dutch Eating Behavior Questionnaire; BES, Binge-Eating Scale.
Subscale evaluation revealed that versatile (adaptable) and inflexible (strict) management, elements of cognitive restraint, elevated within the lifestyle-induced weight reduction group, leading to important variations from the bariatric surgical procedure group at 5–6 and 12 months. In distinction, versatile management remained steady after surgical procedure, whereas inflexible management decreased over the 12-month interval. Among disinhibition subscales, recurring disinhibition decreased solely within the bariatric surgical procedure group, whereas emotional disinhibition remained unchanged in each teams. Situational disinhibition decreased in each teams, with a considerably larger discount within the surgical procedure group. Regarding starvation subscales, sensitivity to exterior starvation cues considerably decreased in each teams, whereas the interior starvation alerts remained unchanged over 12 months. Observed standardized impact sizes diverse throughout consuming habits outcomes, leading to substantial variability in achieved energy (S1 Table); consequently, null findings for outcomes with small to reasonable impact sizes ought to be interpreted cautiously.
Decreased restrained, emotional, and exterior consuming in DEBQ following bariatric surgical procedure, and elevated restraint and decreased exterior consuming following lifestyle-induced weight reduction
Next, we examined consuming behaviors utilizing the DEBQ questionnaire. At baseline, restrained consuming didn’t differ between the bariatric surgical procedure and lifestyle-induced weight reduction teams (Fig 2, Table 3, S3 Table). Over time, restrained consuming decreased following bariatric surgical procedure and elevated after lifestyle-induced weight reduction, leading to a big between-group distinction at each 5–6 and 12 months. Emotional consuming triggered by adverse emotions declined considerably within the bariatric surgical procedure group, whereas no adjustments had been noticed within the lifestyle-induced weight reduction group, leading to a big between-group distinction at 5–6 months. External consuming pushed by sensory cues (scent, style, or sight of meals) decreased equally in each teams over 12 months.
Absence of binge-eating dysfunction, with decreased binge consuming behaviors throughout weight reduction in each teams
Additionally, we assessed the severity of the binge consuming patterns utilizing the BES. No binge-eating dysfunction was reported in both group at any timepoint. BES scores had been comparable at baseline and decreased over 12 months in each teams, with no important variations within the extent of discount between the bariatric surgical procedure and lifestyle-induced weight reduction teams at 5–6 and 12 months (Fig 2, Table 3, S3 Table).
Higher cognitive restraint and larger reductions in starvation susceptibility following lifestyle-induced weight reduction than with bariatric surgical procedure after accounting for weight reduction
During follow-up, individuals within the bariatric surgical procedure group misplaced extra weight than these within the lifestyle-induced weight reduction group. To account for this distinction, adjustments in consuming behaviors had been analyzed relative to every 1% of weight misplaced (Fig 3, Table 4). All variables had been additionally standardized (i.e., z-scores) to allow direct comparability throughout scales.
Fig 3. Change in standardized eating behaviors per percentage of weight loss between 0 and 12 months in the bariatric surgery- versus lifestyle-induced weight loss interventions.
*p < 0.05, **p < 0.01, ***p < 0.001. Abbreviations: TFEQ, Three-Factor Eating Questionnaire; DEBQ, Dutch Eating Behavior Questionnaire; BES, Binge-Eating scale.
These analyses confirmed reverse behavioral profiles within the two interventions. Over 12 months, the biggest standardized consuming behavioral adjustments per share of weight reduction within the bariatric surgical procedure group had been decreases in the primary scale for disinhibited consuming (β = −0.38), the subscale for situational disinhibition (β = −0.45), and exterior consuming (β = −0.40). In distinction, essentially the most pronounced adjustments within the lifestyle-induced weight reduction group had been will increase in the primary scale for cognitive restraint of consuming (β = +1.20), the subscales for versatile management (β = +1.17) and inflexible management (β = +0.99).
Compared to the surgical procedure group, the lifestyle-induced weight reduction group confirmed considerably larger will increase in restrained consuming (DEBQ) and cognitive restraint (TFEQ), together with each versatile and inflexible management subscales, indicating an opposing sample between the teams, even after adjusting for weight reduction. Moreover, the lifestyle-induced weight reduction group demonstrated a considerably larger discount in susceptibility to starvation, together with each inner and exterior starvation subscales, in contrast with the surgical procedure group. For different consuming behavioral traits, the identical quantity of weight reduction from each interventions was related to the same diploma of change between the teams.
Individual questions revealed decreased triggers to overeat following bariatric surgical procedure and elevated restraint behaviors following lifestyle-induced weight reduction
To higher perceive the character of the reported eating-behavior adjustments, we performed an exploratory, descriptive examination of particular person questionnaire gadgets from the TFEQ, DEBQ, and BES over the 12-month follow-up (S4–S9 Tables). Given the restricted pattern measurement, these item-level observations ought to be interpreted as hypothesis-generating moderately than inferential.
In TFEQ, descriptive patterns steered a lower in disinhibited consuming following bariatric surgical procedure, and a rise in cognitive restraint of consuming with lifestyle-induced weight reduction (S4 Table, S7 Table). After surgical procedure, individuals tended to report much less overeating triggered by interesting meals or by seeing others overeat, in addition to fewer difficulties leaving meals on their plate or stopping consuming. In addition, it appeared that strict management over meals consumption grew to become much less needed, as acutely aware weight-reduction plan efforts occurred much less regularly. In distinction, individuals within the lifestyle-induced weight reduction group appeared to indicate larger reliance on acutely aware restraint methods, comparable to consciously consuming lower than desired or adjusting consumption in response to weight fluctuations. However, each teams described adopting small behavioral adjustments to control consumption (e.g., taking smaller parts or skipping dessert). Another notable similarity between the teams was associated to starvation. After bariatric surgical procedure, diminished starvation was a generally reported theme, making dietary adherence much less difficult and decreasing the urge to eat spontaneously. Following lifestyle-induced weight reduction, the response to the sight of scrumptious meals appeared much less pronounced, and individuals demonstrated improved starvation management, discovering it simpler to cease consuming earlier than ending their meals.
Exploratory item-level developments within the DEBQ (S5 Table, S8 Table) confirmed lowered exterior and restrained consuming post-surgery. Interestingly, individuals within the lifestyle-induced weight reduction group appeared to mix lowered exterior consuming with will increase in restrained consuming. After bariatric surgical procedure, the style, scent, sight, or availability of scrumptious meals appeared to have a diminished impression on consuming. In the lifestyle-induced weight reduction group, individuals reported fewer temptations to purchase meals, much less overeating of tasty meals, and larger resistance to consuming treats. Weight loss following bariatric surgical procedure was additionally related to lowered avoidance of consuming to regulate weight and fewer compensatory behaviors after overeating. In distinction, individuals within the lifestyle-induced weight reduction group reported elevated restrained consuming, mirrored in additional frequent refusal of meals or drinks on account of weight issues, stricter monitoring of meals consumption and consuming lower than desired.
BES merchandise patterns post-surgery (S6 Table) indicated a discount in polarized consuming behaviors (i.e., overeating adopted by fasting), fewer preoccupations with controlling urges to eat, and decreased self-consciousness relating to physique weight or measurement. Similarly, individuals within the lifestyle-induced weight reduction group (S9 Table) additionally reported much less polarized consuming, with a lowered tendency to overeat till uncomfortably full or to eat impulsively with out experiencing bodily starvation.
These exploratory patterns present qualitative context for the broader behavioral adjustments noticed on the scale and subscale degree however shouldn’t be interpreted as impartial statistical findings.
Discussion
This examine in contrast one-year adjustments in consuming behaviors and metabolic outcomes after bariatric surgical procedure and lifestyle-induced weight reduction. Despite bigger weight reduction and metabolic enhancements after surgical procedure, lifestyle-induced weight reduction was characterised by a larger enhance in consuming restraint and management, and this divergence persevered after analyzing adjustments per 1% physique weight misplaced in every cohort. Both interventions had been related to reductions in overeating-related traits, reactivity to exterior meals cues, and susceptibility to starvation, however the sample of change differed. After surgical procedure, enhancements in starvation and cue-driven consuming occurred alongside steady or lowered restraint, in step with a extra computerized shift in urge for food and consuming regulation. In distinction, lifestyle-induced weight reduction mixed reductions in overeating and exterior consuming with a marked rise in acutely aware, effortful restraint methods. These findings recommend that early eating-behavior adaptation after weight reduction is intervention-specific and will have implications for long-term weight upkeep.
Most adjustments in consuming behaviors occurred throughout the first 5–6 months, comparable to the interval of biggest weight reduction and most frequent monitoring. Over time, nevertheless, some behavioral adjustments might diminish or reverse, significantly within the lifestyle-induced weight reduction group, which confirmed a pattern towards weight regain after six months. Supporting this, a earlier examine reported that constructive adjustments in consuming habits, comparable to decreases in emotional consuming, starvation, disinhibition, and meals reward and will increase in dietary restraint, persevered for as much as a 12 months after bariatric surgical procedure however not after lifestyle-induced weight reduction, the place weight regain was noticed [27]. These findings recommend that lifestyle-induced weight reduction might primarily result in short-term behavioral variations.
Notably, we noticed opposing trajectories in restrained consuming (DEBQ) following bariatric surgical procedure and lifestyle-induced weight reduction. Specifically, consuming restraint elevated with lifestyle-induced weight reduction however decreased after surgical procedure. The same sample emerged within the TFEQ subscale for inflexible management, whereas versatile management elevated solely within the lifestyle-induced weight reduction group and remained unchanged after bariatric surgical procedure. Some research have reported unchanged [15,38–40] and even elevated [41] consuming restraint after bariatric surgical procedure, partly contradicting our findings. In distinction, many research have proven will increase in consuming restraint following lifestyle-induced weight reduction [21,23,42,43]. Interestingly, one comparative examine reported elevated dietary restraint one 12 months after intervention solely within the bariatric surgical procedure group however not after lifestyle-induced weight reduction [27], differing from our outcomes. However, our findings align with research exhibiting reductions in need to eat and potential meals consumption following bariatric surgical procedure [25], in addition to lowered choice for extremely palatable meals, noticed by means of purposeful magnetic resonance imaging [14,44]. These adjustments might scale back the necessity for acutely aware restraint, in step with our statement that favorable shifts in consuming restraint and weight happen post-surgery with out strict effort. In distinction, individuals within the way of life group appeared to require extra lively behavioral methods to keep up dietary management. This divergence might mirror physiology: satiety hormones [e.g., glucagon like peptide 1 [45,46], peptide YY [45,47,48], and cholecystokinine [45,47]] enhance after bariatric surgical procedure however stay unchanged or lower after lifestyle-induced weight reduction. This might assist to clarify why lifestyle-induced weight reduction necessitates extra deliberate management over consuming, whereas post-surgical adjustments seem extra biologically pushed.
Similar adjustments in consuming patterns following bariatric surgical procedure and lifestyle-induced weight reduction included lowered susceptibility to starvation, much less lack of management overeating, and decreased responsiveness to exterior meals cues. However, the lower in disinhibition (TFEQ) appeared extra pronounced within the bariatric surgical procedure group at 12 months, whereas the lifestyle-induced weight reduction group confirmed solely a transient lower at 5 months. Reductions in externally pushed consuming and overeating following surgical procedure have additionally been reported beforehand [15,39–41], whereas reductions following way of life interventions are usually short-term [21,22], in step with the patterns seen in our information. Supporting this, one examine demonstrated a lower in disinhibition after bariatric surgical procedure, however not after lifestyle-induced weight reduction at one 12 months [27]. Evidence means that bariatric surgical procedure might naturally scale back cravings [16], whereas lifestyle-induced weight reduction might require lively methods to handle overeating [43,49]. Two research instantly evaluating surgical and lifestyle-induced weight reduction reported reductions in starvation, will increase in fullness [25] and decreased hedonic starvation [26,27] in each teams, according to our outcomes exhibiting diminished starvation after each interventions. Another comparative examine discovered that surgical procedure individuals skilled much less starvation and larger satiety, whereas the lifestyle-induced weight reduction group reported the other [50]. Several extra research have constantly reported diminished starvation following bariatric surgical procedure [8–10]. However, proof for starvation adjustments following lifestyle-induced weight reduction is blended, with some research reporting decreased [20–22] and others elevated [17,18] emotions of starvation. These discrepancies could also be defined by variations in measurement instruments. Specifically, the TFEQ captures behavioral penalties of starvation and the way starvation drives meals consumption, offering perception into patterns individuals can be taught to control. Studies utilizing the TFEQ have proven decreases in starvation associated consuming habits following lifestyle-induced weight reduction, in step with our findings [21,22]. In distinction, research utilizing visible analog scale primarily assess quick perceptions of starvation, which have been proven to extend following lifestyle-induced weight reduction [17,18]. It is subsequently believable that, whereas subjective notion of starvation might enhance, people might concurrently be taught to reply to these cues with larger restraint.
To discover behavioral adjustments relative to weight reduction in each bariatric surgical procedure and lifestyle-induced weight reduction teams, we standardized consuming habits scores and scaled them in accordance with share of weight reduction. This evaluation confirmed an opposing sample in consuming restraint: a lower after surgical procedure and a rise after lifestyle-induced weight reduction. Thus, even after accounting for weight reduction, individuals within the lifestyle-induced weight reduction group appeared to require extra acutely aware effort to restrict meals consumption, whereas restriction grew to become much less needed after surgical procedure. Another notable discovering associated to starvation, which decreased extra per share of weight reduction within the lifestyle-induced weight reduction group than within the surgical procedure group. Although starvation declined in each teams, the lifestyle-induced group skilled much less general weight reduction, which can have contributed to the comparatively larger discount in starvation per share of misplaced weight. These findings align with earlier research reporting blended outcomes on starvation following lifestyle-induced weight reduction [17,18,20–22]. This might partly mirror the event of realized behaviors aimed toward regulating starvation and managing meals consumption, although additional analysis is required.
The adjustments in consuming patterns following bariatric surgical procedure might stem from neurohormonal and physiological adjustments, together with hypothalamic signaling, shifts in intestine hormone and bile acid secretion, and adjustments within the intestine microbiota [6]. In distinction, lifestyle-induced weight reduction might contain endocrine variations in gastrointestinal hormones that resist continued weight reduction and will promote weight regain [7]. One comparative examine confirmed that gastrointestinal hormone profiles shifted extra favorably to control starvation simply 10 weeks following bariatric surgical procedure in contrast with way of life intervention [25]. These physiological advantages doubtless contribute to lowered starvation and diminished temptation to overeat after surgical procedure, whereas people present process way of life intervention should actively prohibit consuming and overcome organic mechanisms that oppose additional weight reduction.
To higher perceive which behavioral parts might need influenced the noticed adjustments, we performed an exploratory, descriptive examination of the qualitative traits of consuming behaviors by figuring out the person questionnaire gadgets that confirmed the best change over time in every intervention group. Bariatric surgical procedure individuals appeared to turn out to be much less weak to inner alerts and environmental triggers for (over)consuming and extra typically reported a decreased want for cognitive management, as acutely aware weight-reduction plan efforts diminished. In distinction, individuals within the lifestyle-induced weight reduction group appeared to undertake realized behaviors that required sustained consideration to restrict meals consumption, comparable to consuming lower than desired and refusing meals or drinks on account of weight issues. Although each teams reported a diminished susceptibility to starvation and exterior consuming cues, the character of those adjustments differed. Bariatric surgical procedure individuals extra typically reported lowered starvation itself (e.g., they had been now not consistently hungry and wanted much less acutely aware weight-reduction plan as starvation decreased), whereas the lifestyle-induced weight reduction group individuals moderately answered methods to handle persistent starvation (e.g., consuming lower than desired, skipping dessert, taking smaller parts). Similarly, bariatric surgical procedure individuals reported responding much less to sensory meals cues (e.g., style, scent, and sight of meals, or social conditions), whereas lifestyle-induced weight reduction group individuals appeared to undertake situational coping methods to handle such triggers (e.g., inhibiting to purchase from native meals shops and resisting scrumptious meals).
Both teams reported behaviors like skipping dessert when satiated or decreasing portion measurement, however probably for various causes. After surgical procedure, these behaviors might need stemmed from bodily limitations and discomfort, together with nausea and vomiting [24]. In distinction, lifestyle-induced weight reduction individuals doubtless adopted these behaviors to regulate meals consumption [24]. A 1994 examine by Greenstein [24] discovered that bariatric surgical procedure individuals primarily stopped consuming to keep away from vomiting, whereas lifestyle-induced weight reduction individuals stopped for look or well being. This distinction helps our findings: bariatric surgical procedure might promote bodily satiety, whereas lifestyle-induced weight reduction can depend on psychological motivation to limit consumption. Thus, the standard and supply of behavioral adjustments after bariatric surgical procedure might contribute to extra sustainable long-term outcomes.
Strengths of this examine embody the standardized scientific setting, with assessments carried out in the identical analysis unit by the identical researchers, examine nurses, and dietitians, in addition to comparable follow-up period and comparable pattern sizes between teams. Both research used intensive, structured follow-up with excessive go to attendance; accordingly, we had full 12-month follow-up for the individuals included within the current evaluation in each the life-style and surgical teams. We recognized key adjustments in consuming habits one 12 months after each interventions, offering a basis for future analysis into physiological mechanisms underlying these behavioral variations. However, our examine additionally has limitations. First, consuming behaviors had been assessed utilizing self-reported questionnaires, which can introduce reporting bias. Nonetheless, these devices are extensively used and validated. Second, the comparatively small pattern measurement limits the generalizability of our findings. Third, weight-loss trajectories differed between interventions: weight reduction plateaued within the way of life group by 6 months, whereas it continued by means of 12 months after surgical procedure. Because these trajectories might each affect and be influenced by consuming behaviors, longer follow-up with bigger samples might be essential to make clear the temporal relationships and their implications for weight upkeep. Additionally, the teams differed in sure baseline metabolic and behavioral traits, as they weren’t initially designed for direct comparability. To deal with this, we adjusted analyses for age, intercourse, baseline BMI and baseline final result values. We additionally standardized analyses by share of weight reduction to allow extra equitable comparisons. The use of particular person questionnaire gadgets on this examine sheds gentle to the interpretation of the info however ought to thought to be exploratory and hypothesis-generating moderately than confirmatory. Lastly, as a result of weight, metabolic outcomes, and consuming behaviors had been measured on the identical time factors, we can’t intervene causality between behavioral and physiological adjustments.
Conclusion
Bariatric surgical procedure was related to a pure discount or stabilization of consuming restraint, whereas lifestyle-induced weight reduction required elevated cognitive management and acutely aware restriction of meals consumption. Importantly, this opposing sample remained important even after adjusting for weight reduction. While each interventions lowered susceptibility to starvation, overeating, and exterior consuming, bariatric surgical procedure led to a larger discount in overeating. Interestingly, when adjusted for share weight reduction, lifestyle-induced weight reduction was related to a larger relative lower in starvation. However, the character of this transformation differed: bariatric surgical procedure appeared to decrease bodily starvation and reactivity to exterior meals cues, whereas lifestyle-induced weight reduction prompted the adoption of compensatory behaviors to deal with sustained starvation and exterior consuming triggers. These findings recommend that sustaining weight reduction and favorable consuming behaviors could also be extra cognitively demanding after lifestyle-induced weight reduction because of the elevated want for ongoing self-regulation. Further analysis is required to establish the physiological mechanisms underlying these behavioral variations.
Supporting data
S1 Table. Effect sizes (Cohen’s d) and statistical power for eating behavior variables.
Effect size was quantified as Cohen’s d for the between-group difference in change from baseline to the final follow-up timepoint, corresponding to the group × time interaction estimate from the linear mixed-effects models. Post hoc power was calculated using G*Power with the test family t tests.
https://doi.org/10.1371/journal.pone.0346240.s001
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S2 Table. Weight loss and metabolism following bariatric surgery and lifestyle-induced weight loss at baseline, 5/6 months, and 12 months.
Linear mixed models were used to assess timepoint differences. Models were adjusted for sex, age, baseline BMI and baseline value of the outcome variable. Values are reported as mean ± standard deviation (SD). Significant values are shown in bold. Abbreviations: SD, standard deviation; BMI, body mass index; HOMA-IR, homeostatic model assessment for insulin resistance; LDL, low-density lipoprotein; HDL, high-density lipoprotein.
https://doi.org/10.1371/journal.pone.0346240.s002
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S3 Table. Eating behaviors following bariatric surgery and lifestyle-induced weight loss at baseline, 5/6 months, and 12 months.
Linear mixed models were used to assess timepoint differences. Models were adjusted for sex, age, baseline BMI and baseline value of the outcome variable. Values are reported as mean ± standard deviation (SD). Significant values are shown in bold.
https://doi.org/10.1371/journal.pone.0346240.s003
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S4 Table. Most changed individual questions from TFEQ between baseline and 12 months in the bariatric surgery induced weight loss group.
Abbreviations: Q, question; T1, timepoint 1 (0 months); T3, timepoint 3 (12 months). For comparisons, we used McNemar’s test of symmetry for dependent variables and considered p < 0.05 statistically significant. Significant values are shown in bold.
https://doi.org/10.1371/journal.pone.0346240.s004
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S5 Table. Most changed individual questions from DEBQ between baseline and 12 months in the bariatric surgery induced weight loss group.
Abbreviations: Q, question; T1, timepoint 1 (0 months); T3, timepoint 3 (12 months). For comparisons, we used McNemar’s test of symmetry for dependent variables and considered p < 0.05 statistically significant. Significant values are shown in bold.
https://doi.org/10.1371/journal.pone.0346240.s005
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S6 Table. Most changed individual questions from BES between baseline and 12 months in the bariatric surgery induced weight loss group.
Abbreviations: Q, question; T1, timepoint 1 (0 months); T3, timepoint 3 (12 months). For comparisons, we used McNemar’s test of symmetry for dependent variables and considered p < 0.05 statistically significant. Significant values are shown in bold.
https://doi.org/10.1371/journal.pone.0346240.s006
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S7 Table. Most changed individual questions from TFEQ between baseline and 12 months in the lifestyle-induced weight loss group.
Abbreviations: Q, question; T1, timepoint 1 (0 months); T3, timepoint 3 (12 months). For comparisons, we used McNemar’s test of symmetry for dependent variables and considered p < 0.05 statistically significant. Significant values are shown in bold.
https://doi.org/10.1371/journal.pone.0346240.s007
(DOCX)
S8 Table. Most changed individual questions from DEBQ between baseline and 12 months in the lifestyle-induced weight loss group.
Abbreviations: Q, question; T1, timepoint 1 (0 months); T3, timepoint 3 (12 months). For comparisons, we used McNemar’s test of symmetry for dependent variables and considered p < 0.05 statistically significant. Significant values are shown in bold.
https://doi.org/10.1371/journal.pone.0346240.s008
(DOCX)
S9 Table. Most changed individual questions from BES between baseline and 12 months in the lifestyle-induced weight loss group.
Abbreviations: Q, question; T1, timepoint 1 (0 months); T3, timepoint 3 (12 months). For comparisons, we used McNemar’s test of symmetry for dependent variables and considered p < 0.05 statistically significant. Significant values are shown in bold.
https://doi.org/10.1371/journal.pone.0346240.s009
(DOCX)
Acknowledgments
The authors thank the next colleagues for his or her contributions to this work: Tarja Hallaranta (examine nurse), Elisa Silvennoinen (dietician) and the entire Obesity Research Unit crew. We additionally thank the examine individuals for his or her invaluable contribution.
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