epilepsy
"I had 4 grand mal seizures in a week and was prescribed the generic Keppra, Levetiracetam.  At first I had no appetite what so ever and lost about 20lbs after taking it for a month.  I also had extreme constipation that required another visit to the ER.  However, once being on the medication for a couple months, I started to get my appetite back, but I craved different foods, mostly healthy foods, instead of the food I use to eat.  I also take vitamin D, B and folic acid, which I think has significantly improved my mood.  I feel after some adjusting this medication improved my mood, stopped my seizures, lessened my anxiety and changed my eating habits.  I will say I have an aversion to meat.  I can hardly stand to look at red meat."