The aim of this study done in healthy, non-malnourished young and elderly subjects, is to measure the bioavailability of protein intake and the variation of metabolic markers following consumption of pea protein " NUTRALYS ® S85 plus" or a reference protein brought in water either alone or at the end of a standardized meal.

Inclusion Criteria:

• Adult male volunteers, aged over 65 or under 30
• Body mass index (weight in kg/ height² in m²) between 22 and 28 kg/m²,
• Subjects considered to be healthy by the principal investigator doctor according to the interview, medical and clinical examination,
• Biological assessment considered compatible with participation in the study,
• Persons able to sign the informed consent,
• Persons affiliated to social security scheme.

Exclusion Criteria:

• Pathologies or treatments not compatible with the study
• Food allergy or a contraindication to the consumption of the products tested
• Subject in a situation which, in the opinion of the investigator, could interfere with their optimal participation in the study or constitute a particular risk for the subject,
• Subject with a particular diet (vegetarians, vegans, nutritional supplements, etc.),
• Subject weighing < 55 kg,