Peanut Sip Feeding Protocol

Inclusion criteria: * Previous completion of IRB2023-0549: Prandial Metabolic Phenotyping in Sarcopenic Older Adults Comparing Plant Based and Whey Based Protein (NCT06628349) * Age 65-80 years old * Stable body-weight (less than ±5% in the previous 6 months) * Ability to walk, sit down, and stand up (independently or with walking assistance device) * Willingness to lay supine in bed for up to 6 hours * Willingness and ability to comply with the protocol Exclusion criteria * Established diagnosis and active treatment of chronic disease: Insulin dependent diabetes mellitus, active malignancy, heart disease, kidney disease, liver disease, HIV/AIDS, Asthma (moderate to severe), Hep (A,B, or C) * History of untreated metabolic disease including hepatic or renal disorder * Presence of acute illness or metabolically unstable chronic illness * Active dependence of alcohol or drugs * Use of short course of oral corticosteroids within 4 weeks preceding study day * Current use of long-term oral corticosteroids * Use of protein or amino acids containing nutritional supplements within 5 days of the first study day * Planned elective surgery requiring 2 or more days of hospitalization during the entire study * (Possible) pregnancy * Failure to give informed consent or Investigator's uncertainty about the willingness or ability of the subject * Already enrolled in another clinical trial * Any condition according to the PI or nurse that was found during the screening visit, that would in…