If I have to eat fast food, then usually I'll go to Wendy's and go for the grilled chicken breast sandwich and get chilli instead of fries and a side salad. My real weakness is for Taco Bell and I usually hit that about once per month, but I don't go crazy and I keep the portion size down. I haven't had anything bud diet soda in years.
As for pizza, I bet I have that once or twice per week, but I have a smaller portion with turkey pepperoni. I supplement the meal with a piece of fruit and some low fat yogurt. If you're a pepperoni fan, try the turkey pepperoni. I thought it would be gross, but I tried it any way and it turned out to be a tasty low fat alternative.
My body fat is holding at about 6.7 %, so it must be working OK for me.
Tedster