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Whey protein consumption is reported to reduce serum lipids, however the responses to derived peptides have not yet been fully characterized. In this study, we evaluated the effects of whey protein-hydrolyzed peptides (WPP) on serum and hepatic lipid levels, as well as hepatic lipogenic gene expression in SD rats consuming a high-sucrose AIN-76 based diet. After a 14-day ad libitum consumption of diet containing WPP, serum and hepatic triglycerides, and total cholesterol levels were significantly decreased when compared with the control group. A similar trend was observed in the time-restricted feeding groups, in which food was provided for 2 h at the beginning and the end of the dark period cycle during the 14-day treatment period. Additionally, hepatic gene expression linked to triglyceride and cholesterol biosynthesis, and their enzymatic activities were downregulated in the WPP group. In conclusion, daily consumption of WPP appears to decrease lipid levels in the blood and liver, and potentially protect against dyslipidemia.

Whey Protein-hydrolyzed Peptides Diminish Hepatic Lipid Levels in Rats Consuming High-sucrose Diets