- Subject is currently taking medications/dietary supplements/substances that could modulate metabolism or weight in the opinion of the principal investigator or physician, e.g. progestational agents, steroids, growth hormone, dronabinol, marijuana, beta-hydroxyl-beta-methylbutyrate (HMB), free amino acid supplements, dietary supplements to aid weight loss. Exceptions for multi-vitamin/mineral supplement, inhaled steroids for asthma, topical or optical steroids and short-term use (less than two weeks) of Dexamethasone.