What is the scientific logic behind fasting in religions?

Answer 1

It overhauls your body as during a planned maintenance shutdown of machines.

answer:

In the bodies of fasting people, epinephrine and cortisone hormones mix into the bloodstream more easily. These hormones have effects also on cancerous cells. They serve as a shield against cancer; that is, they prevent the growth of cancer cells. Indeed, the body of a fasting person is in maintenance mode. The fat that surrounds internal organs melts away. The body becomes invigorated and gathers physical strength with an increased level of resistance to Diabetes as well as stomach, kidney, heart, and liver diseases.

The liver takes a rest for 3-5 hours during fasting, thereby stopping storage of food substances for a while. In the mean time, it prepares globulins, which will boost the immune system. Muscles in the stomach and cells that release secretions, too, have a rest for some time during fasting hours. As the volume of blood circulating in the body decreases and consequently blood pressure drops, the heart relaxes.

If waste materials from food are not burned thoroughly, they impair arteries. Unburned fats make arteries narrower and cause the disease called arteriosclerosis. [During the practice of fasting], nearly no substance is left in the body towards sunset. That is, all substances are metabolized. Hence, fasting is beneficial for some diseases, especially for arteriosclerosis sufferers. Other body organs, too, get a chance to rest. Eating less and fasting are of vital importance for body health.