Fasting is a constructive treatment which helps excrete harmful toxins that cause diseases in the body. It is starvation which is destructive – which kills the body with malnutrition, not a fast. Rather millions die due to various diseases caused by over eating. Scientific fasting does not weaken the body, rather strengthen it. In most cases, from the 3rd day onwards, the body starts using stored fat for its energy. Each gram of fat releases 9 calories of energy, and thus, our total energy needs can easily be met by our excess stock of fat in the body. In fact, the fasting results in making a person feel light and hence, more energetic.