Whey-based cheese provides more postprandial plasma leucine than casein-based cheese: A pig study

Area of Science:

• Nutrition Science
• Dairy Science
• Gastroenterology

Background:

• Healthy aging requires optimal nutrition, including adequate protein intake for muscle maintenance.
• Dairy products, such as cheese, are significant sources of amino acids, including leucine, crucial for muscle protein synthesis.
• Whey and casein are the two primary proteins found in milk, differing in their digestion and absorption rates.

Purpose of the Study:

• To compare the bioavailability of amino acids, specifically leucine, from whey-based versus casein-based cheese.
• To investigate the potential of whey protein cheese to enhance muscle protein synthesis for healthy aging.

Main Methods:

• An in vivo digestion model using pigs was employed to assess nutrient absorption.
• Two isocaloric, solid dairy products (cheese) were used: one whey-based and one casein-based (Mozzarella).
• Postprandial plasma leucine concentrations and duodenal effluent dry matter were measured.

Main Results:

• Whey-based cheese contained 25% more leucine than casein-based Mozzarella.
• Pigs digesting whey cheese showed twice the postprandial plasma leucine concentration compared to those digesting casein cheese.
• Differences in gastric emptying did not account for the observed variations in leucine bioavailability.

Conclusions:

• Whey protein cheese demonstrates superior leucine bioavailability compared to casein cheese.
• Whey protein cheese may be more effective in stimulating muscle synthesis in elderly individuals.
• Findings support the use of whey-based dairy products for targeted nutritional strategies in aging populations.