Novel Dietary Interventions for Treating Insulin Resistance

December 10, 2013 updated by: Dorothy Sears, University of California, San Diego
Clinical and rodent studies have demonstrated the impact of specific dietary factors in modulating inflammation-related diseases including insulin resistance, type 2 diabetes, and cardiovascular disease. Such dietary factors include polyunsaturated fats, polyphenols, and glycemic index. The investigators know from previous studies in the literature that reducing the glycemic index and increasing the omega-3 fat and polyphenol content of the diet results in improved metabolic indices and reduced inflammation. These improvements can be observed even within the context of persistent obesity. The investigators will implement a reduced-calorie, multi-pronged dietary approach for improving insulin sensitivity and reducing inflammation in obese subjects with the metabolic syndrome. The active diet will include reduced glycemic index foods together with omega-3 fats and polyphenol supplements. The primary hypothesis is that the dietary combination of reduced glycemic index foods, omega-3 fats and polyphenols will work to reduce insulin resistance and inflammation more efficiently than a placebo-controlled, calorie- and macronutrient-matched diet in obese subjects with the metabolic syndrome.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

41

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
    • California
      • San Diego, California, United States, 92093
        • University of California, San Diego

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 55 years (Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Body Mass Index (BMI): 30.0-40.9 kg/m^2
  • Metabolic Syndrome

Exclusion Criteria:

  • Diabetes
  • Inflammatory diseases
  • Eating disorders
  • Pregnancy
  • Known kidney, coronary, gastrointestinal or peripheral artery disease
  • Smoking
  • Recent fish oil (>500mg eicosapentaenoic acid (EPA) + docosahexaenoic acid (DHA)/day) or polyphenol supplement use
  • Recent weight change
  • Strenuous exercise
  • Fish/food allergies
  • Current diabetic, lipid-lowering (fibrates, statins), anti-inflammatory, immune-suppressant, and/or anti-inflammatory hypertension medication use

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: Basic Science
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Single

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Active Diet
Reduced glycemic index bread products, fish oil capsules, and polyphenol capsules.
Dietary supplement: Fish Oil
fish oil capsules
Dietary supplement: Polyphenol Capsules
delphinidin polyphenol capsules
Other: Reduced glycemic index bread products
Made by Zone Labs
Placebo Comparator: Placebo Diet
Market variety bread products, corn oil capsules, and corn starch capsules.
Dietary supplement: Corn Oil Capsules
Corn Oil Capsules
Dietary supplement: Corn starch capsules
Maltodextrin capsules
Other: Market variety bread products
placebo bread products

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Change in insulin resistance
Time Frame: Baseline, 6 weeks, and 12 weeks
Fasting plasma insulin, Homeostasis Model of Assessment - Insulin Resistance (HOMA-IR)
Baseline, 6 weeks, and 12 weeks

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Change in inflammation biomarkers
Time Frame: Baseline, 6 weeks, 12 weeks
Fasting plasma cytokines and C-reactive protein (CRP), monocyte expression of inflammatory genes
Baseline, 6 weeks, 12 weeks

Other Outcome Measures

Outcome Measure
Measure Description
Time Frame
Change in adipokines
Time Frame: Baseline, 6 weeks, 12 weeks
Fasting plasma adiponectin and leptin
Baseline, 6 weeks, 12 weeks

Collaborators and Investigators

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

Sponsor

University of California, San Diego

Investigators

  • Principal Investigator: Dorothy Sears, PhD, University of California, San Diego

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, 2012

Primary Completion (Actual)

July 1, 2013

Study Completion (Actual)

November 1, 2013

Study Registration Dates

First Submitted

December 4, 2013

First Submitted That Met QC Criteria

December 4, 2013

First Posted (Estimate)

December 10, 2013

Study Record Updates

Last Update Posted (Estimate)

December 12, 2013

Last Update Submitted That Met QC Criteria

December 10, 2013

Last Verified

December 1, 2013

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • IRB #110549

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.

Clinical Trials on Obesity

Clinical Trials on Fish Oil

Search Similar Trials

Sponsors and Collaborators

Medical Conditions

Drug Interventions

CROs by country

CROs in Uruguay

Conditions

Rare Diseases

Drug Interventions

Dietary Supplements

Sponsor/Collaborators

Locations

Subscribe