This wasn't the case with me.
Although I did and sometimes still do have funny habits iwth eating. Like there is always certain foods I can't eat if they are attatched to a certain thought or image. Or sometimes if I have a thought about "eating that particular food that particular day"... It can be tricky and sometimes I have gone hungry.
I'm not underweight though.

My OCD has presented itself in various ways throughout the years, including through my eating habits. I had anorexia for a short time, and then had problems with overeating. These were mostly sustained, not by bad self-image, but by OCD. I couldn't not think about my weight and would constantly analyze my thoughts on the issue. I would overeat simply because my mind told me to do so. It took a long time and lots of willpower to overcome those things, but I am still triggered to overeat when I am ill (a rather long story as to why).

The thing that worked best for me was to talk about it, receive support, and distract myself with other activities, especially with friends. Mindfulness (http://en.wikipedia.org/wiki/Mindfulness_%28psychology%29) has helped a good deal with my current obsessions and compulsions.

Hope you find some help! HUGS.

When I was diagnosed with Celiacs Disease the school had to make special meals for me that were gluten free. I was pissed with the diagnosis which caused me to eat less. Then I was scared of eating the food at school because my OCD told me I would get food poisoning if I ate the food. So I began to barely eat anything and began to fall into an eating disorder. I began to like feeling hungry and then I would feel sick everytime I ate. I felt that if I didn't have food in my stomach then there would be no way I could throw up. So pretty much the diagnosis and the OCD made me fall into an eating disorder and I know it will return when I return to school.

Mine were related, but they still need to be treated separately. One is much closer to an addiction than the other... well, at least for me.