Prandial Metabolic Phenotyping in Sarcopenic Older Adults Comparing Plant Based and Whey Based Protein

Inclusion Criteria:

* Age 50-95 years old
* Diagnosis of Chronic Obstructive Pulmonary Disease (COPD); COPD group only
* Stable body-weight (±5%) for the past 3 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
* Hysterectomy
* 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
* Presence of fever within the last 3 days
* 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 interfere with the study or safety of the patient
* Known allergy to any of the components of the feeding (soy, pea, or whey - dairy)
* Established daily diet of vegetarian / vegan composition
* \<23 MoCa score