I'm probably not going to be MUCH help, but I needed to lose about 10# of fat and build muscle tone while doing it so I started eating a high protein diet while eating less of the bad stuff, but not cutting it out completely. It kept me going working at the barn all day (what a luxury! Didn't even have to work out!) and in about a month I was in the best shape of my life! Once I reached my goal, I continued the high protein thing while at work and started to eat whatever once I got home, then watching what I eat a little more on days that I don't work.
On the "thin is not in" comment, that is true! I've been doing all of this in hopes of getting signed by a modeling agency in the next few weeks. If you go to an agency looking emaciated, they'll turn you away as soon as they see it! There was some VS girl though that would stop eating 48 hours before any live appearance, then stop drinking anything, even water the day of!!! I can't BELIEVE how she gets away with that crap or even how she does it! I've gone without food for a day (usually sick :( ) but never water too! O_O Ugh so bad for you... So no, fad diets are not good. Lol