Participants will be in the hospital for about 4 days. On the morning of surgery, blood and urine collection will occur. During surgery, substances called tracers, measuring the extent of protein synthesis and breakdown, will be injected into a vein for the first metabolic study. Additional blood and muscle samples will also be taken. After surgery, when participants arrive in the surgical recovery unit and are able to eat, they will begin to record all food intake and will receive their assigned treatment. Treatment, in the form of gel capsules, will be taken 2.5 hours after each meal. Urine will be collected throughout hospitalization and blood will be collected each morning. Prior to discharge, a 24-hour metabolic study will be performed, including tracer injections and muscle biopsies. After discharge, participants will be provided with 6 weeks' worth of their assigned treatment. Follow-up visits will occur 2 and ~6 to 8 weeks after surgery. These visits will include various muscle function and physical performance tests. Participants will also undergo a dual energy x-ray absorptiometry (DEXA) scan, which will be used to determine muscle mass.