The purpose of the study is to determine the feasibility of nutritional interventions designed to help older patients maintain physical function after being in the hospital. We will test the feasibility and effect of nutritional interventions with whey protein, collagen or placebo on functional recovery from hospitalization in community dwelling older adults.

We will compare in a randomized parallel design double blind pilot phase I study the feasibility of whey protein vs. collagen vs. isocaloric placebo supplementation in older adults during an acute hospitalization for a medical condition, and the treatments' effect size on physical function after hospital discharge.

Inclusion Criteria:

• Aged 65 years or older.
• Admitted to UTMB hospital for any acute medical condition
• English speaking

Exclusion Criteria:

• Inability to consent
• Bed or wheelchair bound prior to hospitalization
• Estimated creatinine clearance 20 ml/min or less, or end stage renal disease not on dialysis
• AST/ALT 2.5 times above the normal limit
• Active cancer
• Palliative care/Hospice
• Estimated protein intake >1.2 g/kg/day during the previous 24 hours
• Any other condition or event considered exclusionary by the PI and faculty physician

No. This is a small Phase 1 feasibility pilot study. Risk of loss of confidentiality