Interest for specific populations – Older adults Insufficient protein intake can lead to sarcopenia, characterized by the loss of muscle mass, strength, and function. • Healthy older adults (> 65 y.) need to increase the amount of high-quality proteins in their diet (1 g protein /kg body weight /day). ESPEN guidelines • Ageing leads to changes in the functionality of the digestive tract but the impact of ageing on digestion, and absorption of nutrients is still unclear (Lee et al., 2021). Investigate high-protein dairy products digestion in vitro Study the influence of age on the kinetics of proteolysis in the gastric and intestinal phase of digestion