Dietary Whey Protein Lows the Risk for Metabolic Disease in Mice Fed a High-Fat Diet

Consuming a high-fat ( IF) diet produces excessive weight gain, ad posity, and metabolic complications associated w th r ss for developing type 2 diabetes and fatty liver disease. This study evaluated the influence of whey protein so ate (WPI) on systemic energy balance and metabol c charges in mice fed a HF diet. Female C57BL/6 mice received for 11 wk a I-IF jet with or without 100 g WPI/L drinking water. Energy consumption and glucose and lipid metabolism were examined. WPI mice had lower rates of body weight gain and percent body fa: and greater lean body mass, although energy consumption was unchanged These results were cars stoat w th WPI mice having higher basal metabolic rates. respiratory quotients, and hepatic mitochondria a respiration Health implications for WPI were reflected in early biomarkers for fatty river disease and type 2 diabetes. rivers from WPI mice had significantly fewer hepatic lipid droplet numbers and less deposition of nonpolar lipids. Furthermore, WPI improved glucose tolerance and insulin sensitivity. We conclude that in mice receiving a HF diet, consumption of WPI results in higher basal metabolic rates and altered metabolism of dietary lipids. Because WPI mice had less hepatosteatosis and insulin resistance, WPI dietary supplements may be effective in slowing the development of fatty liver d sease and type 2 diabetes. J. Nutr. 141. 582-587, 2011.