Real-time Amino Acid Profiling

Inclusion Criteria: * Age ≥65 and ≤80 * BMI ≥20 and ≤32 kg/m2 * Non-smoking * Healthy as assessed by the NIZO lifestyle and health questionnaire ("Verklaring leefgewoonten en gezondheid") and according to the judgment of the study physician. * Regular and normal Dutch eating habits as assessed by the NIZO lifestyle and health questionnaire (3 main meals per day) * Veins suitable for cannulation (blood sampling) * Voluntary participation * Having given written informed consent * Willing to comply with study procedures * Accept use of all encoded data, including publication, and the confidential use and storage of all data for 15 years. * Accept disclosure of the financial benefit of participation in the study to the authorities concerned Exclusion Criteria: * Participation in any clinical trial including blood sampling and/or administration of substances up to 30 days before day 1 of this study * Having a history of medical or surgical events that may significantly affect the study outcome, including: Inflammatory bowel disease, hepatitis, pancreatitis, ulcers, gastrointestinal or rectal bleeding; major gastrointestinal tract surgery such as gastrectomy, gastroenterostomy, or bowel resection; known or suspected gastrointestinal disorders, colon or GI tract cancer * Use of the following medication: glucose lowering drugs, insulin; medication that may impact gastric emptying (e.g. gastric acid inhibitors or laxatives) * Diagnosed with diabetes, being treated for high blood glucose or increased fasting blood glucose (\> 7 mmol/l in finger prick blood) as assessed during screening visit * For men: Hb \<8,5 mmol/l as assessed during screening visit; for women: Hb \<7,5 mmol/l. * Use of protein supplements * Mental status that is incompatible with the proper conduct of the study * A self-reported reported food allergy or sensitivity to dairy ingredients * Alcohol consumption for men \> 28 units/week and \>4/day; for women: \>21 units/week and \>3/day * Reported unexpected weight loss or weight gain of \> 3 kg in the month prior to pre-study screening, or intention to lose weight during the study period * Reported slimming or medically prescribed diet * Recent blood donation (\<1 month prior to Day 01 of the study) * Not willing to give up blood donation during the study * Personnel of NIZO food research and FrieslandCampina, their partner and their first and second degree relatives * Not having a general practitioner * Not willing to accept information-transfer concerning participation in the study, or information regarding his or her health, like laboratory results and eventual adverse events to and from his general practitioner