Ahhhh, if only food was JUST fuel. Wouldn't be all be thin, fuel efficient machines.
Food is a curious thing. My mother can't stand to look at another "Boiled Dinner" (cabbage, carrots, potatoes & kielbasa) while it's my home-sick food. When we were dirt poor, that's what we had. Heck, I had no idea it was cheap food, I just knew that it meant family to me.
When you're not feeling good, you're even more vunerable. Heck, my mom gets offended if I don't call her with the typical daughter whine, "Mooooommmm, I'm sick!" Not only are you physically weakened but you're emotional weakened ("why is my body doing this?" "what did I do wrong?") Personally, I take it very hard when my body rebels against me.
There are a few of things that I do when I'm in this state.
First, find a fix. Chicken broth, boiled dinner with turkey kielbasa, etc. I don't go for the "I'll only have ONE rice krispies treat/no-bake cookie." because it's a LIE.

I won't stop.
I journal. I rarely journal what's wrong with me because it would be a very boring journal. I journal the memories that accompany the comfort food. For instance, when I miss my sister, I crave kool-aid and white bread with microwaved american cheese. (I don't make this up kids). So, I journal about how I used to trick her into making kool-aid for me ("Oh A-, you make the BEST kool-aid, how do you make it again?" C'mon, she was like 9 years old) or I journal about why I miss my sister.
Finally, I concentrate on what my body needs. If I'm under the weather, I may want to eat 3,000 calories in one sitting but it's not going to make me get well any faster. Would stretching? Would a nap help? How about a cup of herbal tea? Sometimes I visualize white blood cells attacking the enemy, or sometimes I draw it (hey, I'm a freak!).
If this film thing doesn't work out, I am SO going into Art Therapy.
