A Very High Fiber Diet Versus a Low-carbohydrate Diet for Weight Loss

June 27, 2014 updated by: Loma Linda University

A Very High Fiber Diet Versus a Low-carbohydrate Diet for Weight Loss in Obese Individuals With or Without Type 2 Diabetes

Using a 2x2 complete factorial design, approximately 140 obese men and women who may or may not have type 2 diabetes will be randomized to one of two conditions (70 in each condition): (a) a high fiber diet, or (b) a low-carbohydrate diet. Participants will be instructed to follow their assigned diets for 1 year. Outcome measures of interest will include participants' BMI, waist circumference, blood lipids (total, HDL, and LDL cholesterol, and triglycerides), C-reactive protein, and gastrointestinal peptides. Participants will be recruited from the Loma Linda and San Bernardino city area in southern California.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

173

Phase

  • Phase 4

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
    • California
      • Loma Linda, California, United States, 92354
        • Loma Linda U Medical Center Diabetes Treatment Center

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 and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • BMI 30.0-42.0 kg/m2
  • English-speaking

Exclusion Criteria:

  • Pregnancy
  • Lactation
  • Acute or chronic infection
  • Type 1 diabetes
  • Participation in another trial
  • Active cancers
  • Currently using Byetta
  • Currently on weight loss medication
  • Weight loss of more than 4 lbs. within the last 3 months
  • Vegan
  • Active eating disorder
  • Gastrointestinal problems that may be worsened by a high fiber intake

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: Factorial Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Low-carbohydrate diet
Other: High fiber vs. low-carbohydrate diets
High fiber diet involves at least 40 grams of dietary fiber or more per day for women and at least 50 grams of dietary fiber per day for men. Low-carbohydrate diet involves less than 120 grams of carbohydrate per day for both men and women.
Experimental: High fiber diet
Other: High fiber vs. low-carbohydrate diets
High fiber diet involves at least 40 grams of dietary fiber or more per day for women and at least 50 grams of dietary fiber per day for men. Low-carbohydrate diet involves less than 120 grams of carbohydrate per day for both men and women.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Weight
Time Frame: 1 year
1 year

Secondary Outcome Measures

Outcome Measure
Time Frame
Lipid profiles
Time Frame: 1 year
1 year
Gastrointestinal hormones
Time Frame: 1 year
1 year
Waist circumference
Time Frame: 1 year
1 year
C-reactive protein
Time Frame: 1 year
1 year
Blood glucose
Time Frame: 1 year
1 year
Serum insulin
Time Frame: 1 year
1 year
Hemoglobin A1c
Time Frame: 1 year
1 year

Collaborators and Investigators

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

Sponsor

Loma Linda University

Collaborators

Lifestyle Center of America

Investigators

  • Study Chair: Serena Tonstad, MD, PhD, MPH, Loma Linda University

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

January 1, 2010

Primary Completion (Actual)

September 1, 2011

Study Completion (Actual)

September 1, 2011

Study Registration Dates

First Submitted

January 14, 2010

First Submitted That Met QC Criteria

January 15, 2010

First Posted (Estimate)

January 18, 2010

Study Record Updates

Last Update Posted (Estimate)

July 1, 2014

Last Update Submitted That Met QC Criteria

June 27, 2014

Last Verified

June 1, 2014

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 59217

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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