At the screening visit, all inclusion and exclusion criteria will be reviewed (including participant demographics and measurement of weight and height to calculate BMI). After confirmation of meeting demographic and BMI criteria (this may be the same day as the screening visit), participants will proceed with Baseline Visit 1 (BV1) assessments, including a fasting blood draw for a metabolic panel, blood cell count, and blood for storage. After a snack, participants will undergo further assessment for blood pressure, depression (using the Center for Epidemiologic Studies Depression Scale; CES-D), cognition (using the Montreal Cognitive Assessment; MoCA), processing speed (Digit Symbol Substitution test; DSST), spirometry (FEV1), waist circumference, and grip and leg power/strength. At the end of this visit, participants will be provided with instruction on how to collect accelerometry data and a 24-hour urinary specimen to assess protein intake, both of which will be collected at the subsequent testing session. Because several measures that are taken at the BV1 visit also serve as screening tests (including: blood work from the metabolic panel, blood pressure, depression, and cognition), any person with results from these tests that do not meet eligibility criteria will not be invited to enroll and as indicated, advised to share any abnormal test results with their physician. Also, any participant with abnormal test results at the follow-up testing visits will be referred for further medical evaluation.