[suzzer99]

I lost 50lbs in college in about 6 months. My metabolism has been [censored] up ever since. I gain weight looking at food. I get more exercise and eat less than most people I know and I just maintain.

OP, if you really do this through ridiculous amounts of exercise, and not ridiculously starving yourself you'll be ok. But you basically would have to go from a big dough-ball to an exercise junkie overnight. I don't think that happens on command. Otherwise you'll be starving yourself to a degree, and possibly be in my boat the rest of your life. You probably don't have a great metabolism to begin with.

30 with water weight is probably a lot less severe than 50 though.