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Open research questions in Bariatric Surgery and Outcomes

43 unresolved questions extracted from the limitations and future-work sections of 456 Bariatric Surgery and Outcomes papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • In addition, the 12-month follow-up period is insufficient to evaluate long-term durability of weight loss, recurrent weight regain, gastroesophageal reflux, bile reflux, nutritional deficiencies, marginal ulceration, and other late postoperative complications that are particularly relevant when evaluating newer bypass procedures such as SASJ.

    Comparison of 12-Month Outcome of Single Anastomosis Sleeve Jejunal Bypass Compared to Roux-en-Y Gastric Bypass and Sleeve Gastrectomy: A Propensity Score Matching Analysis · 2026 · DOI

  • However, the changes of emotional eating after sleeve gastrectomy (SG), its impact on short-term weight loss outcomes, and sex differences in emotional eating are still not well established.

    Patterns of Emotional Eating Changes After Sleeve Gastrectomy · 2026 · DOI

  • These findings support growing evidence that ADHD symptoms and executive dysfunction represent clinically relevant but frequently under-recognized features in bariatric popula- tions [10, 11].

    ADHD, Impulsivity, and Affective Symptoms in Metabolic and Bariatric Surgery Candidates · 2026 · DOI

  • The choice of revisional procedure—conversion to RYGB or laparoscopic fundoplication using the excluded stomach—evolved over time as the fundoplication technique was progressively introduced into clinical practice, reflecting a non-randomized, time-dependent allocation—a major limitation of this comparison.

    Laparoscopic Fundoplication Using the Excluded Stomach Versus Conversion to Roux-en-Y Gastric Bypass for Refractory Reflux After One-Anastomosis Gastric Bypass: A Retrospective Comparative Analysis of Safety and 1-Year Outcomes · 2026 · DOI

  • However, in patients undergoing bariatric surgery, cognitive response has shown inconsistent results, with either an increase or no change in other studies [33].

    Postoperative Changes in Eating Behavior After Sleeve Gastrectomy are Associated With IL-10 Independent of Anthropometric Changes · 2026 · DOI

  • Whether it reflects changing referral practices, evolving societal attitudes, or increased recogni- tion of cardiometabolic risk in male adolescents warrants further study [2, 13, 15].

    Impact of the COVID-19 pandemic on racial disparities in adolescent bariatric surgery: an MBSAQIP analysis · 2026 · DOI

  • As a result, the direction of this potential selection bias, whether evaluations disproportionately reflect higher or lower per- forming trainees, remains unclear and cannot be determined within the structure of the SIMPL dataset alone. Interpretation of the high proportion of open foregut procedures is limited by the SIMPL database, which does not distinguish planned open operations from cases converted from minimally invasive approaches.

    SIMPL data, complex procedures: a national analysis of chief resident competency in foregut and bariatric surgery · 2026 · DOI

  • Sleeve gastrectomy (SG) is increasingly used to facilitate transplant eligibility; however, the safety of simultaneous SG and KT (SG + KT) remains poorly defined at a multi-institutional level.

    30-Day Outcomes of Simultaneous Sleeve Gastrectomy and Kidney Transplantation: An Analysis from the Metabolic and Bariatric Surgery Accreditation and Quality Improvement Program (MBSAQIP) Database · 2026 · DOI

  • are grounded in the medication's half-life, which is approximately 5 to 7 days. This period is thought to be sufficient to allow for a substantial reduction in the drug's concentration, thereby decreasing the risk of aspiration of retained gastric contents due to the slowed gastric emptying time. Concurrent concerns for patients on these and other long- Uva Clinical Research Lab 2026 © Uva Clinical Anaesthesia and Intensive Care ISSN 2827-7198 26 June 2026 Anesthetic Management and Bariatric Surgery: 12 Uva Clinical Research Lab 2026 © Uva Clinical Anaesthesia and Intensive Care ISSN 2827-7198 26 June 2026 Anesthetic Management and Bariatric Surgery: acting diabetic medications include the difficulties with bag-mask ventilation, and the potential for severe hypoglycemia in the efficacy of preoxygenation. A documented instance of little to no oral intake when patients history of a difficult airway with anesthesia in remain NPO after the procedures, necessitating the past is a cardinal risk factor that must be careful perioperative glucose management.[21] prominently noted and integrated into the A standard and comprehensive preoperative assessment of the airway is an indispensable component of the pre-anesthetic evaluation. While it is a clinical maxim that not all obese patients present with difficult airways, the comorbidities and habitus frequently render airway management more challenging. In the upright, sitting position, the patient should be systematically assessed for cervical range of motion, encompassing extension, flexion, and rotation; mandibular movement, including protrusion and retrusion; the range of mouth opening; and the Mallampati score as a predictor of laryngeal visibility. Furthermore, the thyromental and interincisal distances, the presence of missing, overlapping, or loose dentition, and the presence of palatal tori should airway management plan. Beyond the airway, the patient's body habitus and adipose tissue can also make standard intravenous (IV) access and physiologic monitoring more difficult. This may necessitate the use of longer IV needles, the employment of ultrasound guidance to identify target vessels, or even the establishment of central venous access to secure adequate routes for fluid and drug administration. Similarly, the use of intra- arterial blood pressure monitoring should be strongly considered if noninvasive pressure monitoring cannot be consistently and reliably obtained via standard cuff pressure, and the use of ultrasound to facilitate arterial cannulation should be considered here to increase the first- pass success rate. be meticulously noted.

    Anesthetic Management and Bariatric Surgery: A Comprehensive Review of Pathophysiological Considerations, Evolving Guidelines, and Optimizing Patient Outcomes · 2026 · DOI

  • extend consideration for surgery to individuals with a BMI greater than or equal to 30 kg/m² who present with concurrent metabolic disease, such as type 2 diabetes mellitus or hypertension, acknowledging the potent metabolic benefits of surgery that extend beyond weight loss alone. A range of bariatric and metabolic surgical procedures are currently in use, each employing distinct mechanisms to achieve weight loss, which can be broadly categorized into restrictive, malabsorptive, or combined effects. These include adjustable gastric bands, sleeve gastrectomy (gastric "sleeve"), vertical banded gastroplasty, Roux-en-Y gastric bypass (with or without a duodenal switch), and endoscopically placed space-occupying devices such as intragastric balloons. Uva Clinical Research Lab 2026 © Uva Clinical Anaesthesia and Intensive Care ISSN 2827-7198 26 June 2026 Anesthetic Management and Bariatric Surgery: 7 Uva Clinical Research Lab 2026 © Uva Clinical Anaesthesia and Intensive Care ISSN 2827-7198 26 June 2026 Anesthetic Management and Bariatric Surgery: Adjustable gastric bands are a restrictive device stomach that remains in continuity with the that is placed around the fundus of the stomach intestines. Beyond its restrictive mechanism, to create a small pouch and narrow outlet, this procedure exerts significant metabolic thereby reducing gastric capacity by external effects by resecting the gastric fundus, the compression. Initially, this procedure was primary site of ghrelin production, thereby perceived as a less aggressive and reversible reducing hunger.

    Anesthetic Management and Bariatric Surgery: A Comprehensive Review of Pathophysiological Considerations, Evolving Guidelines, and Optimizing Patient Outcomes · 2026 · DOI

  • in neck mobility, of anxiolytics (e.g., benzodiazepines) to allay Uva Clinical Research Lab 2026 © Uva Clinical Anaesthesia and Intensive Care ISSN 2827-7198 26 June 2026 Anesthetic Management and Bariatric Surgery: 13 Uva Clinical Research Lab 2026 © Uva Clinical Anaesthesia and Intensive Care ISSN 2827-7198 26 June 2026 Anesthetic Management and Bariatric Surgery: anxiety and facilitate a smooth induction, (if present), and a preoperative fasting period of antisialagogues (e.g., glycopyrrolate) to dry solid foods for 6 hours before surgery, while secretions and improve visualization, and allowing a carbohydrate beverage for loading 2 preemptive antiemetics (e.g., IV steroids and hours before the procedure. However, the transdermal scopolamine patches) to reduce the evidence for multimodal pain management baseline risk of PONV. Pain control can be techniques, including the use of regional initiated preemptively through multimodal anesthetic techniques such as thoracic epidurals techniques, including non-steroidal antifor laparotomy approaches, is of much higher inflammatory drugs (NSAIDs), antispasmodic quality, and its use is strongly encouraged to agents, and oral opioids, tailored to the patient's manage pain effectively and avoid the baseline pain and prior medication usage. The emetogenic effects of high-dose opioids.

    Anesthetic Management and Bariatric Surgery: A Comprehensive Review of Pathophysiological Considerations, Evolving Guidelines, and Optimizing Patient Outcomes · 2026 · DOI

  • Abstract Introduction Binge eating (BE) and addictive-like eating behaviors, as assessed by the Yale Food Addiction Scale (YFAS) may change following metabolic bariatric surgery (MBS), yet their long-term trajectories and relationship with weight recurrence remain unclear.

    Binge Eating and Addictive-Like Eating Behaviors Seven Years After Sleeve Gastrectomy: Implications for Long-Term Weight Loss Outcomes · 2026 · DOI

  • It remains unclear how changes in insurance coverage of GLP-1 receptor agonists for obesity during late 2025 and early 2026 will impact the economic landscape and incentivization…

    Distribution of adult certified bariatric surgery centers in the United States: are we meeting the needs of the people? · 2026 · DOI

  • Several limitations merit consideration. First, MBSAQIP lacks granular intraoperative physiologic, anesthetic, and workflow data that may further explain postoperative risk. Second, several intraoperative variables reflect surgeon discre- tion, introducing confounding by indication that limits causal inference. Additionally, the study cohort excluded patients with preoperative infection, sepsis, or other high-risk condi- tions to create a more homogeneous analytic sample, which may limit generalizability to higher-risk populations encoun- tered in routine clinical practice. Third, rare outcomes—par- ticularly mortality—are difficult to model robustly due to low event frequency, constraining interpretability of performance estimates. Fourth, MBSAQIP does not provide identifiers to account for hospital- or surgeon-level clustering. Practice pat- terns such as drain use, robotic assistance, leak testing, and discharge thresholds may vary across centers, and residual confounding from unmeasured center-level effects may influ- ence both intraoperative variable use and outcomes. Finally, length of stay is strongly influenced by institutional pathways, discharge practices, and social factors that are incompletely captured in registry data, limiting explainable variance even with intraoperative inputs. In addition, laboratory variables were handled using median imputation with missingness indicators, which may introduce bias compared with more robust approaches such as multiple imputation. Moreover, multiple outcomes were evaluated using similar predictor sets, which may increase the risk of type I error due to multiple comparisons; however, interpretation focused on the consis- tency and magnitude of effects rather than isolated statistically significant findings. Furthermore, intraoperative variables are recorded at or near the end of surgery and therefore reflect the accumulated operative course rather than time-resolved intra- operative decision points.

    Postoperative Risk Evolves in the Operating Room: Incremental Value of Routine Intraoperative Variables After Metabolic and Bariatric Surgery · 2026 · DOI

  • Conclusions regarding the long-term efficacy of BS in relation to the level of nutritional levels are limited. Analyzing follow-up remission with nutritional levels is a strength of the current study. Despite its efforts, our study did not achieve the complete personal follow-up needed to measure clinical and nutritional characteristics. This underlines that sustained efforts are needed to maximize retention and tracking, one of the major challenges of large, multi-center, observational clinical studies of BS. Another weakness is the under-reporting of nutrient categories in the data collection. To provide more effective nutritional advice, more nutrients should be covered and more data on vitamins and minerals should be included. DECLARATIONS Authors’ contributions Designed the research: Z.H., L.Y., and L.H; Supervised patient recruitment and data collection: L.Y., L.H; Performed the patient recruitment, the patient examination, the experimental work and data collection: S.Z., S.J., X.J., C.X., Y.L., X.Y; Analyzed and interpreted the data: S.L. and Z.H; Wrote the paper: Z.H.

    Association of Nutritional Level with Remission and Nutritional Advice in Obesity Surgery · 2026 · DOI

  • The available literature is limited by heterogeneity in study design, variability in HbA1c thresholds, and predominance of observational data. Additionally, few studies have specifically addressed the interaction between BMI and HbA1c, highlighting the need for further research [13–15]. Another important limitation is the lack of standard- ized outcome reporting across surgical subspecialties. Different studies prioritize differ- ent endpoints, ranging from superficial wound complications to mortality and readmis- sion, making direct comparison difficult. This variability weakens the ability to derive universally applicable perioperative thresholds. Finally, most available studies do not incorporate robust multivariable analyses capable of separating the independent and combined effects of obesity and glycemic dysregulation. This reinforces the need for prospective, methodologically rigorous investigations.

    Obesity, Glycemic Control, and Surgical Outcomes: Exploring the Relationship Between Body Mass Index, HbA1c, and Postoperative Morbidity · 2026 · DOI

  • Body weight Body weight analysis was limited to surviving rats (10 rats per group), as deceased rats could not be assessed for weight loss. As weight loss outcomes could not be assessed in rats that died postoperatively, these rats were excluded from this comparison, leaving 10 rats per group.

    Sleeve-fundoplication without gastric resection vs. sleeve gastrectomy: comparable weight loss with reduced GERD incidence in obese rats · 2026 · DOI

  • Although early weight loss has consistently been associated with greater overall weight reduction, its relationship with subsequent weight regain in routine clinical practice remains insufficiently characterized.

    Association Between Early Weight Loss and One-Year Weight Regain After Lifestyle-Based Obesity Treatment: A Retrospective Cohort Study · 2026 · DOI

  • An important limitation is that detailed data regarding obesity-related comorbidities (including diabetes, hypertension, and cardiovascular disease) and medication use during the preoperative period were not systematically collected.

    Association Between Delayed Metabolic and Bariatric Surgery Completion and Postoperative Cardiometabolic Outcomes · 2026 · DOI

  • These findings suggest that pandemic-era changes in healthcare delivery may have reduced longstanding access barriers, though the mecha- nisms remain uncertain.

    Impact of the COVID-19 pandemic on racial disparities in adolescent bariatric surgery: an MBSAQIP analysis · 2026 · DOI

  • Whey protein supplementation may help preserve fat-free mass after bariatric surgery; however, current evidence remains limited by small sample sizes, methodological heterogeneity, and moderate to very low certainty evidence.

    The potential effect of whey protein supplementation in post-bariatric surgery patients: a systematic review and meta-analysis of randomized controlled trials · 2026 · DOI

  • Obesity and severe obesity represent an increasingly impor- tant and underrecognized modifier of colorectal cancer (CRC) care.

    SAGES colorectal and metabolic bariatric surgery committee joint task force call to action for synchronized severe obesity and colorectal cancer management · 2026 · DOI

  • Although concomitant hiatal hernia repair during laparoscopic sleeve gastrectomy has been widely adopted, long-term data beyond 5 years remain limited, and the clinical relevance of anatomical recurrence is still poorly defined.

    Long-Term Anatomical Durability and Clinical Outcomes of Concomitant Laparoscopic Sleeve Gastrectomy and Hiatal Hernia Repair: Up to 10-Year Multicenter Analysis · 2026 · DOI

  • Depression, weight-related experiential avoidance, and negative automatic thoughts are common in individuals seeking bariatric surgery, yet their interrelationships remain underexplored.

    Depression, Psychological Inflexibility, and Automatic Thought in Bariatric Surgery Candidates · 2026 · DOI

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43 open questions have been extracted from the limitations and future-work passages of 456 Bariatric Surgery and Outcomes papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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