Essential Amino Acid Supplementation in Adult Spinal Deformity Patients

Inclusion Criteria: * Males and Females, 40 to 65 years old * Diagnosed with adult spinal deformity * Scheduled for ASD corrective procedure at UAMS (\>2 weeks prior to surgery) * Live near Little Rock and scheduled to attend physical therapy in Little Rock * COVID-19 negative and/ or asymptomatic Exclusion Criteria: * Subject who does not/will not eat animal protein sources. * Diagnosed metabolic or hormonal disease (i.e., renal, cardiovascular, thyroid, polycystic ovary syndrome, or type I/II diabetes mellitus). * Currently pregnant. * Gave birth or was lactating within previous 12 months. * History of chemotherapy or radiation therapy for cancer in the 6 months prior to enrollment. * Clinically significant weight gain or loss (\>5% change) in the last 12 months. * Consuming metabolism-altering drugs or medications (i.e., corticosteroids, stimulants, insulin). * Diagnosis of autoimmune disease * Currently receiving androgen (e.g., testosterone) or anabolic (e.g., GH, IGF-I) therapy. * Diagnosis of muscular degenerative/dystrophy disease * Unwilling to fast overnight. * Unwilling to avoid using other protein or amino-acid supplements during participation.