How much weight will you lose if you eat nothing and exercise for a week?

Worst thing you can do. Your body will think it's starving and survival mode will kick in and screw up (slow down) your metabolism. You will not feel good. Instead, try a Fast or body detox, plan with juices, or protein powders. Try the "Fast Track One Day Detox Diet". Search at Amazon or another book site for it. It's not really one day, you do a week prep, then the detox fast, then a three day recovery. You can exercise all you want. Except on the Fast Day, I believe. Check it out. Don't just Not Eat. Everyone knows it's just stupid and makes things worse. Your metabolism slows down and you lose weight slower. BTW...ephedra is legal again and works great as a appetite supressant. Check out some nutritional supplement websites and you'll see all kinds of stuff.