For guys.

If a girl is overweight and starts being anorexic to lose weight..do you think that is wrong?
I mean, would you rather date her heavy or skinny?

If she loses the weight she will obviously be more attractive too so, what your opinion on anorexia?

or even bulimia?

its wrong...you should never do that it will destroy your internal systems. if the girl doesn't want to be fat..then eat healthy and excersize. everyone has there one soulmate. and they wont care how the other looks.

Why the extreme? Ummm, do you want me to be obese, or anorexic? Come on there are healthy alternatives. Be comfortable. Personally I would rather have a woman with alittle something to hold on to.

Did you know that eating disorders are actually a mental illness? If given the choice, I know I would rather date a girl who's perhaps a little overweight but happy and confident with herself than a skinny girl with a mental illness, wouldn't you?
Actually a lot of guys would rather their girlfriends not be super skinny because it's kind of intimidating to them.
I agreed with rickd, why the extremes? Join a kickboxing class, buy some tae bo tapes, go jogging or walking every day, cut back on the fast food and candy and drink more water! It's summer, there are so many fun and active things to do outside!