Whey Protein's Impact on Type 2 Diabetes: Researchers Examine the Evidence

Researchers have been exploring the connection between whey protein and type 2 diabetes, highlighting the potential benefits of whey protein supplements in maintaining glycaemic control. According to a recent narrative review, impaired glycaemic control is a significant risk factor for developing type 2 diabetes, and whey proteins, rich in branched-chain amino acids (BCAA), may play a crucial role in regulating metabolism and muscle protein synthesis. The study, conducted at the University of Reading, utilized a systematic search approach to examine the effects of whey protein intake on plasma BCAA concentrations and glycaemic control in both normoglycaemic humans and those with insulin resistance or type 2 diabetes.

Key Takeaways:

• Impaired glycaemic control is a major risk factor for developing type 2 diabetes, a worldwide health epidemic linked to diet and obesity.
• Whey proteins (WP) are rich in branched-chain amino acids (BCAA), essential for muscle protein synthesis and metabolic regulation.
• Fasting plasma concentrations of BCAA are maintained around 350 μM but become chronically elevated by 10-25% in persons with type 2 diabetes.
• Six acute studies reported significant elevations in postprandial BCAA and insulin responses following WP consumption between 10 and 50 g.
• Three chronic studies reported inconsistent findings on the impact of 9-51 g of WP/day on fasting BCAA and glycaemic control.
• The majority of studies suggest that WP intake may impact circulating BCAA concentrations and contribute to glycaemic control.
• The authors emphasize the need for further research to investigate the relationship between WP consumption, BCAA, and glycaemic control.

Statistics:

• 10-25% increase in fasting plasma BCAA concentrations in persons with type 2 diabetes (comparing to normal values ranging from 350 μM).
• 6 out of 9 included acute studies reported significant elevations in postprandial BCAA and insulin responses following WP consumption.
• 3 out of 6 chronic studies reported inconsistent findings on the impact of WP intake on fasting BCAA and glycaemic control.

Sources:

• The Impact of Whey Protein On Plasma Branched-chain Amino Acids and Glycaemic Control In Humans. a Narrative Review (Nutrition Research Reviews, 2025, www.cambridge.org).
• University of Reading, Department of Food and Nutritional Sciences (Hugh Sinclair Unit of Human Nutrition, Reading, United Kingdom).
• Cambridge University Press, Edinburgh Building, Shaftesbury Road, Cambridge CB2 8RU, England (www.cambridge.org; journals.cambridge.org/action/displayJournal?jid=NRR).