An 18-month Trial of a Low Glycemic Load Diet

August 27, 2010 updated by: Boston Children's Hospital

An 18-month Randomized Controlled Trial of a Low Glycemic Load Diet

The primary aim of this study is to compare the effects of an experimental low-glycemic load diet with those of a conventional low-fat diet among obese young adults in an 18-month randomized-controlled trial.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

The prevalence of obesity has risen dramatically among children in the U.S. since the 1960s. Effective treatment of childhood obesity is widely recognized as instrumental to public health efforts to combat type 2 diabetes and heart disease. Evidence from animal studies, short-term human studies and epidemiology suggests that diets designed to minimize the rise in postprandial blood glucose, that is low glycemic index, may be useful in the treatment of obesity and related complications. This project proposes an month RCT comparing a low glycemic load diet to a conventional low fat diet. Both diet groups will receive identical treatment intensity, behavioral modification and physical activity recommendations. The primary endpoint will be change in percent body fat by dexa-scan at 18 months; other outcomes include insulin resistance and CVD risk factors. Compliance will be assessed by interviewer-administered, 24-hour dietary recalls.

Study Type

Interventional

Phase

  • Not Applicable

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
        • Children's Hospital Boston

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

18 years to 35 years (Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Age 18 to 35 years
  • Body mass index (BMI) ≥ 30 kg/m2
  • Access to a working telephone
  • Conversant in English
  • Written medical clearance from a primary care physician or nurse practitioner, ruling out any pre-existing or complicating medical condition

Exclusion Criteria:

  • Body weight >300 lbs
  • Major medical illness (heart, kidney or liver disease; diabetes; cancer; endocrinopathy; psychiatric illness) or other active medical problem
  • An obesity-associated genetic syndrome (e.g., Prader-Willi)
  • An abnormal screening laboratory test (ALT, creatinine, BUN, hematocrit)
  • Fasting blood glucose ≥ 126 mg/dl)
  • Taking any prescription medication that affects body weight (glucocorticoids, neuropsychiatric agents), blood pressure, or serum cholesterol concentrations
  • Currently smoking (1 cigarette during any of the last 7 days)
  • Previous diagnosis of an eating disorder (anorexia nervosa, bulimia, binge-eating disorder)
  • If female, not pregnant or planning to become pregnant in the next 18 months and not lactating
  • Failure to complete the pre-enrollment visits

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

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

What is the study measuring?

Primary Outcome Measures

Outcome Measure
change in adiposity as measured by dual energy x-ray absorptiometry (DEXA).

Secondary Outcome Measures

Outcome Measure
change in insulin resistance as measured by the homeostasis model assessment; change in glucose tolerance as measured by an oral glucose tolerance test (OGTT); change in cardiovascular disease risk factors

Collaborators and Investigators

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

Sponsor

Boston Children's Hospital

Collaborators

National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Charles H. Hood Foundation

Investigators

  • Study Director: Cara B Ebbeling, PhD, Boston Children's Hospital

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

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

July 1, 2004

Study Completion (Actual)

December 1, 2006

Study Registration Dates

First Submitted

August 12, 2005

First Submitted That Met QC Criteria

August 12, 2005

First Posted (Estimate)

August 15, 2005

Study Record Updates

Last Update Posted (Estimate)

August 30, 2010

Last Update Submitted That Met QC Criteria

August 27, 2010

Last Verified

August 1, 2010

More Information

Terms related to this study

Other Study ID Numbers

  • 59240-#1
  • R01DK059240 (U.S. NIH Grant/Contract)

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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