I think strong candidates for any sort of thing related to eating would be 6th house (health), having either Moon, Venus, and/or Jupiter in the 6th house, or having Jupiter, Venus, and/or Moon make aspects to the 6th house.
I have Pisces Moon in the 6th house and it opposes 1st house Libra Jupiter and tightly squares my 9th house Gemini Venus.
I don't know if I could say that I had an "eating disorder" per se, but when I was 8-10 years old, my home life was chaotic and I ate more than usual. I was probably 10 lbs overweight for my age at the time. If you think about it, 10lbs over the average weight for a kid at those ages is a LOT.
A few months after I turned 10, puberty hit me and I lost weight... like all of it. I also got taller pretty quickly and I suddenly didn't care to eat much either. I became obsessed with starving myself because for whatever reason, I was freaking out about overeating, cut out soda completely, banished sweets from my life, and got even more involved in a vast range of sports. I also became a vegetarian... but not for "health" reasons... it was because I got grossed out on a camping trip and saw my cousin catch a fish.
When I was 25-26 and I was feeling down and out because I knew my marriage was headed towards the end and I was eating huge proportions. I didn't realize I was eating a lot... but I didn't exercise during that time. I went to my doctor and she said I weighed 163lbs which is quite heavy for my 5'3 ft frame (even though I didn't look like I weighed that much). She also said I had "fatty liver" and told me to exercise asap (this was a month after I turned 26). I immediately enrolled in a gym and lost 15lbs in the 1st month, another 10lbs in the 2nd month and after that I kept losing weight in the following months. When I had gotten down to the low 130s, I stopped caring about keeping track of weight but kept exercising regularly. I lost 30lbs within the 1st 6 months of turning things around, which sounds like it's a lot of weight to lose so quickly but it's not. Even my doctor was impressed with me. I still ate a lot, just different stuff, I went to the gym regularly but I had also gotten back into long distance cycling and was riding pretty much everyday for miles and miles.
By the time I celebrated my 27th birthday, I was wearing a size 6 Marc Jacobs dress which was super fabulous. About 4 months after my bday, it was definite that divorce was going to happen...only I didn't allow my depression to throw me off so I worked out even more during that time.
I have Libra Saturn conjunct AC exact... it's very easy for me to loose weight with the slightest change. My Saturn trines 8th house Mars so I can easily keep up routines for long durations of time and I can be very focused and disciplined. Moon in 6th isn't nice on health as it makes things come and go in cycles (overeating when I was a kid and in my mid 20s). Knowing what I know now, I don't want to have to go through another phase of overeating again. If it weren't for my Saturn AC doing damage control, I probably would have a difficult time with weight control.