Role of Dietary Habits in Efficacy of Bariatric Surgery - Study A

December 1, 2025 updated by: Frank AJL Scheer, PhD, Brigham and Women's Hospital
The purpose of the study is to evaluate how dietary habits in the post-surgical year impact outcomes of bariatric surgery.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

The obesity epidemic is a major public health concern with a significant economic burden in the USA. Bariatric surgery is the most effective and durable weight loss treatment, with long-term cardiometabolic health benefits. Among different types of bariatric procedures, sleeve gastrectomy (SG) has become the most commonly performed in USA. While SG is expected to result in a 50-60% excess weight loss, inter-individual differences in weight loss are large and approximately 25% of patients can be considered poor weight-loss responders who either do not lose a substantial amount of weight or regain the lost weight afterwards. The mechanisms underlying this clinical variation remain unknown and interventions to improve on these outcomes critically lacking. Of interest, altered daily dietary habits are experienced by a substantial proportion of bariatric surgery candidates, raising the question whether such alterations may contribute to inter-individual differences in weight loss success. Therefore, the purpose of this study is to evaluate how dietary habits in the post-surgical year impact outcomes of bariatric surgery.

Study Type

Observational

Enrollment (Actual)

290

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Massachusetts
      • Boston, Massachusetts, United States, 02115
        • Brigham and Women's Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

21 years to 60 years (Adult)

Accepts Healthy Volunteers

No

Sampling Method

Non-Probability Sample

Study Population

Patients electing to undergo sleeve gastrectomy.

Description

Inclusion Criteria:

  • Bariatric surgery (sleeve gastrectomy) patients

Exclusion Criteria:

  • Prior bariatric surgical procedures

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort
Intervention / Treatment
Sleeve gastrectomy patients
Patients electing to undergo sleeve gastrectomy will monitor their dietary habits.
Other: Dietary habits
Sleeve gastrectomy patients will be asked to monitor dietary habits before surgery and at 2, 6, and 12 months after surgery.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Change in BMI at 1-year post-surgical
Time Frame: Baseline and one year
Body mass index at one year after surgery compared to baseline
Baseline and one year

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Brigham and Women's Hospital

Collaborators

National Heart, Lung, and Blood Institute (NHLBI)

Investigators

  • Principal Investigator: Ali Tavakkoli, MD, Brigham and Women's Hospital
  • Principal Investigator: Frank Scheer, PhD, Brigham and Women's Hospital

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

December 6, 2018

Primary Completion (Actual)

March 1, 2025

Study Completion (Actual)

March 1, 2025

Study Registration Dates

First Submitted

March 12, 2018

First Submitted That Met QC Criteria

March 18, 2018

First Posted (Actual)

March 20, 2018

Study Record Updates

Last Update Posted (Actual)

December 8, 2025

Last Update Submitted That Met QC Criteria

December 1, 2025

Last Verified

December 1, 2025

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 2017P002526A
  • R01HL140574 (U.S. NIH Grant/Contract)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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