- Regular use of prescription medications. Oral contraceptive use will be permitted, provided the contraceptive has been used for at least two months before starting study. Individuals taking medications for most conditions will be excluded, but medication use for non-serious conditions (e.g., acne) will be considered on a case-by-case basis. In particular, participants currently prescribed SSRIs, neuroleptics, tricyclics, stimulants, or any medication known to affect body weight or eating will be excluded.