Does anyone else hate eating?

First off, I am not one of those 13 or 14 year old kids that write in asking questions. I am in my 40's and have a legitimate question. I absolutely hate to eat. I have to force myself to ingest anything. I don't know why this has happened. Last year I lost 50 lbs. in 3 months. Not because I wanted to, because I did not want to eat. I finally got myself to a point where I started to eat better and gained about 25 lbs back. Now this year it has started again, I simply do not want to eat. Does anyone else have this problem, and what could it be?