Clare is right. You can't drop that many calories, it isn't safe!!! Please don't go on that diet for ur sake. But do run the mile, that is a good plan, but i would gradually build up to it. If you go right into the mile ur first time u could hurt ur self, b/c ur body isn't used to it. I wouls start walking for 20 min. for a couple days, then walk faster (almost a jog) for a copuple days, then jog, for a few days, then do all of that before you run, as ur warm up, when you do get to the point when you can run. Also another good thing to do is split the time u r on the tredmill. do like 15 min in the morning, and like 15/ 20 min at nite, that will also help you lose weight faster. And one more thing (I know this is a lot) vary ur exersie. Do stuff on the tredmill every other day. And every day that u r not on the tredmill, work ur upper body. (Do not do any exercises with ur legs casue they got a work out on the tredmill and they need to rest.) But do like sit-ups and stuff like that, and maintain a healthy diet, and u will be well on ur way to weight loss!!!