A randomized study to demonstrate how animal-based protein-rich food sources can be used by older adults to increase protein intake within pre-existing dietary patterns.

Current dietary patterns of older Americans will be augmented by readily available quality protein sources. Investigators will observe the effects of recommended and common protein intakes on the maintenance of whole-body protein balance and potential for muscle protein anabolism.

3 groups of 10 older subjects will be studied during daily protein intakes. Study duration per subject will be about 2 weeks.

Inclusion Criteria:

• BMI ≤ 35 kg/m2
• Capable of providing informed consent
• COVID-19 negative and/or asymptomatic

Exclusion Criteria:

• Subject who does not/will not eat animal protein sources.
• Body mass index > 35.
• History of chemotherapy or radiation therapy for cancer in the 6 months prior to enrollment.
• Use of insulin to control blood sugar level.
• Currently receiving androgen (e.g., testosterone) or anabolic (e.g., GH, IGF-I) therapy.
• Currently using prescription blood thinning medications.
• Unable or unwilling to suspend aspirin use for 7 days prior to Visit 3.
• Unwilling to avoid using protein or amino-acid supplements during participation.

Starting with enrollment and ending with completion of last study visit; in most cases within 30 days.