I once lost over 20 pounds in about a month-and-a-half. I did it by exercising like crazy and not eating anything over 4 grams of fat.
However, I may have
looked much better, but I didn't
feel very good. It is best to lose weight gradually.
From:
Calorie Control Council | Healthy Weight Calculator
"Most health professionals recommend slow weight loss as the safest and most effective approach. A sensible weight-loss program allows you to lose weight gradually -- about one-half to one pound per week. Gradual weight loss promotes long-term loss of body fat, not just water weight that can be quickly regained.
To lose one pound, a person must burn 3,500 calories more than are consumed (500 calories per day over the course of a week). For example, reducing calories by 300 per day and increasing daily activity to burn off an additional 200 calories should result in a weight loss of one pound per week."