It's three fold.

Part of it is I hate the aspect of taking pictures of food, especially in restaurants. I'm there to eat and enjoy myself, and while I love photography, I also believe taking too many photographs of something can kind of ruin the moment, especially a nice meal. Same with me going to concerts, I don't take pictures. I'm there to enjoy the show, not watch it through a 3" LCD screen. I don't hate people that do it, but as an example I saw this all over Vegas. You have all these wonderful restaurants and expensive meals, and people pulling out their cameras to take pictures of it to post online like it's their first time ever eating a good steak dinner. I don't mean it to sound snobby, I just find it kind of rude.

Two. I don't find pictures of food very interesting. Although I love eating, it's just not a subject I care to photograph. The only food I take pictures of is upon request from my wife, as she is quite the cook and makes some pretty elaborate meals that she wants documented.

Three. Food is actually hard to photograph, especially with plated meals. It's normally low light conditions, it's normally reflective in nature which makes using a strobe difficult, and it's also on a plate that is reflective in most cases. So pictures of food are either too dark, or when hit with a strobe get too many reflection points and it makes the photo look harsh. Only way I do it is with a good tripod, some spot lighting (non strobe), and a tripod.

I do love pictures like others have taken revolving around the subject of food though. Like the fish pic Elizabeth posted, or the black and white one Aksalon posted. I just don't like snapping pics of food itself for the most part.