Obesity Clinical Trial
Official title:
The Metabolic Response to Reduced Branched-chain Amino Acids in Humans 2
One of the primary risk factors for the development of diabetes is obesity. While even moderate weight loss achieved by dieting can lead to improvements in metabolic health, reduced-calorie diets are notoriously difficult to sustain. Over the past decade, a number of groups have shown that low protein diets are associated with metabolic health in both rodents and humans. In particular, specific building blocks of protein- the branched chain amino acids (BCAAs) leucine, isoleucine, and valine - are associated with insulin resistance and diabetes in humans. Blood levels of the BCAAs decrease in humans fed a low protein diet, and we recently showed that reducing either dietary BCAAs or protein rapidly restored normal body composition and insulin sensitivity to diet-induced obese mice without reducing calorie intake. Current study will test the metabolic role of dietary BCAAs in humans by completing an adequately powered, randomized controlled study. A total of 132 subjects stratified by gender will be randomized to one of three groups: 1) Control; 2) Low Protein; 3) Low BCAA. Subjects in each group will replace two meals a day (and 2/3rds of their baseline dietary protein) with meal replacement beverages based on either complete protein powder or a BCAA-free medical food for two months. Primary outcomes will be weight and fasting blood glucose levels. A number of secondary outcomes will also be assessed and blood, adipose, and fecal samples will be collected for integrated transcriptional and metabolomic pathway analysis to identify and compare the metabolic pathways affected by low protein and low BCAA diets.
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