text: how many pounds can you loose if you dont eat for a 5 day period? i wanna loose weight fast, really from my abs. i'm gaining  weight too fast. you can't live that long without food, let alone water. so you would die. just remember to decrease food intake, increase activity/exercise and lots of water... when you starve your body of nutrition your body will start to slow your metabolism down to reserve and store nutrients for later. then if you don't use that nutrients stored, it turns to fat. so keep moving... exercise increases metabolism, eating certain foods can increase your metabolism. fyi: just 3% below average hydration/water in your body can cause your metabolism to slow down. drink lots of water.  i hope this helps, remember dramatic change in diet can make your skin breakout, menestral cycle abnormal, and make your hair more brittle. take care of yourself the rightway and you'll look healthier.