10 pounds in 30 days is reasonable if you want to loose weight 1pound a week is strongly recommend if you want to do it while being healthy if you are loosing a ton of weight but your not eating your not loosing fat your losing muscle wich actually is your bodies natural way to burn fat. Dont starve yourself its so hard on your metabolism! More about fast weight loss here - http://perfectdiets.net/6-foods-that-fight-off-belly-bloat/