Effect of Eight Weeks of Overfeeding on Ectopic Fat Deposition and Insulin Sensitivity: Testing the “Adipose Tissue Expandability” Hypothesis

Diabetes Care July 10, 2014

OBJECTIVE The presence of large subcutaneous adipocytes in obesity has been proposed to be linked with insulin resistance and type 2 diabetes through the “adipose tissue expandability” hypothesis, which holds that large adipocytes have a limited capacity for expansion, forcing lipids to be stored in nonadipose ectopic depots (skeletal muscle, liver), where they interfere with insulin signaling. This hypothesis has, however, been largely formulated by cross-sectional findings and to date has not been prospectively demonstrated in the development of insulin resistance in humans.

RESEARCH DESIGN AND METHODS Twenty-nine men (26.8 ± 5.4 years old; BMI 25.5 ± 2.3 kg/m2) were fed 40% more than their baseline requirement for 8 weeks. Before and after overfeeding, insulin sensitivity was determined using a two-step hyperinsulinemic-euglycemic clamp. Intrahepatic lipid (IHL) and intramyocellular lipid (IMCL) were measured by 1H MRS and abdominal fat on MRI. Subcutaneous abdominal adipose and skeletal muscle tissues were collected to measure adipocyte size and markers of tissue inflammation. Read more

National Minority Quality Forum
Clinical Trial Engagement Network Map Childhood Obesity MapHIV Z-Atlas: Peripheral Arterial Disease Atlas Map Lung Cancer Index Z-Atlas: Chronic Kidney Disease AFIB Index Cardiometabolic Health Aliance Minority Diabetes Coalition U.S. Diabetes Index County Edition U.S. Diabetes Index Research Edition Medicare Index Medicare Index Stroke Edition About The Minority Stroke Working Group Hepatitis C Disease Index Lead Risk Index Map MRSA StrokePAD Minority Index The South Texas Diabetes Initiative Minority Stroke Consortium YouTube NMQF Videos IPAB Action Center National Health Index

© 2021 National Minority Quality Forum, Inc. All Rights Reserved.