My weakness is definitely sweets. I could always generally take or leave fast food. My advice, if you haven't already seen it, is to rent "Supersize Me", the doc. film made by the guy (Morgan Spurlock, I think) who only ate McDonalds for 1 month. Weight issues aside, what it did to his health was quite an eye-opener - turned me right off fast food altogether. Fast Food Nation is also supposed to have the same effect, though I have not seen that one yet.