Effect of Diet Composition on Liver Fat and Glucose Metabolism

Study Overview
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Brief Summary
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This study is designed to determine if the amount of fat and saturated fat in the diet contributes to the development of a condition called fatty liver disease in the absence of changes in weight.

Detailed Description
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A condition called non-alcoholic steatohepatitis is characterized by fat accumulation in the liver and associated inflammation. This condition is strongly associated with obesity, insulin resistance and type 2 diabetes. Diets high in saturated fat result in fatty liver, insulin resistance and liver injury in animal models. Dietary composition may contribute not only to hepatic fat accumulation and insulin resistance but may also promote inflammation leading to chronic liver disease in humans. This study will test the hypothesis that a diet high in fat and saturated fat contributes to liver fat accumulation, insulin resistance and inflammation by comparing the effects of a four-week, weight stable high fat/high saturated fat diet (55% calories from fat/25% saturated fat) with a four-week, weight stable low fat/low saturated fat diet (20% fat/8% saturated fat) in overweight and obese subjects.

Official Title
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Effect of Diet Composition on Liver Fat and Glucose Metabolism

Conditions
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Fatty Liver

Intervention / Treatment
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* Other: high fat/high saturated fat diet
* Other: low fat/low saturated fat diet


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Age 18-55 years old, men and women, otherwise in good general health, BMI >27 kg/m2 Exclusion Criteria: Abnormal glucose tolerance, fasting glucose>100 mg/dl or diabetes History of liver condition or alanine aminotransferase (ALT) above the upper limit of the normal range Use of medications that cause insulin resistance or fatty liver: niacin, glucocorticoids, estrogens, tamoxifen, amiodarone, accutane, sertraline, atypical antipsychotics, anti-HIV medications Chronic use of anti-inflammatory medications (aspirin, ibuprofen, naprosyn, steroids, etc) Average alcohol intake >20 grams/day Tobacco use Creatinine >1.5 mg/dl for men and >1.4 mg/dl for women Hematocrit <33% Pregnancy or lactation Significant weight loss within the past 6 months (>5% body weight) Claustrophobia or any contraindications to being placed in the magnet for the MRS scan such as pacemakers, defibrillators, brain aneurysm clips, etc. Other serious medical conditions or inflammatory conditions such as cancer, inflammatory arthritis, etc. History of multiple food allergies or intolerances or severe food allergies History of coronary artery disease, history of or treatment of hyperlipidemia, LDL >200 mg/dl, fasting triglycerides >300 mg/dl Weight >300 pounds

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 55 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Basic Science
Intervention Model: Single Group Assignment
Masking: Single


Arms and Interventions

| Intervention/Treatment |
| --- |
|Other: high fat/high saturated fat diet|4 weeks 55% fat/25% saturated fat isocaloric diet|
|Other: low fat/low saturated fat diet|4 weeks 20% fat/8% saturated fat isocaloric diet|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| hepatic triglyceride content by MRS |  | 4 weeks | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| insulin sensitivity |  | 4 weeks | 
| systemic and subcutaneous adipose tissue inflammation |  | 4 weeks | 
| oxidative stress markers |  | 4 weeks | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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diet, insulin resistance, fatty liver, inflammation, oxidative stress