It is also a question of genetics and the extent of the current condition (overweight). I think sudden weight loss can be quite harmful to the body. However, 2-3 pounds minus a month is easily available and there will be nothing wrong with it. Of course, many people are impatient and they throw away a lot of that, which they quickly take back, as crazy fasting can’t last long. On the other hand, a healthy diet can be maintained for a long time, and slower weight loss is guaranteed.