Dietary protein intake is essential for tissue renewal and growth. Current recommendations for protein intake are based on studies using egg protein as reference protein. Egg protein is an animal-based protein with a high quality. Protein quality is determined by the composition of (essential) amino acids and digestibility. Therefore, different proteins have a different quality. Due to the environmental crisis, an increasing number of people consumes more plant-based proteins. These plant-based proteins often have a lower protein quality compared to animal-based proteins. Therefore, the aim of this study is to investigate whether optimal protein intake depend on protein quality. The optimal protein intake of an animal-based protein with a high quality (milk) will be compared to the optimal protein intake of a plant-based protein with a low quality (wheat).

Inclusion Criteria:

• Aged between 65-85 years
• BMI between 18.5-30 kg*m^-2
• Healthy, recreationally active (maximal one intensive exercise training per week)
• No physical limitations (i.e., able to perform all activities associated with daily living independently)

Exclusion Criteria:

• Smoking
• Diagnosed musculoskeletal disorders
• Use of any medications known to affect protein metabolism (i.e., corticosteriods, non-steroidal anti-inflammatories)
• Chronic use of gastic acid-suppressing medication or anti-coagulants
• Unstable weight over the last 3 months
• Diagnosed GI tract disorders or diseases
• Blood donation in the past 2 months

Data will be made available upon request

Protein beverages with milk- or wheat composition will look similar.