@KSman I am saying the benifts of fasting are there and they are a lot just a quick search and I found this:
The physiological effect of fasting includes lower of blood sugar, lowering of cholesterol and lowering of the systolic blood pressure. In fact, Ramadan fasting would be an ideal recommendation for treatment of mild to moderate, stable, non-insulin diabetes, obesity and essential hypertension. In 1994 the first International Congress on "Health and Ramadan," held in Casablanca, entered 50 research papers from all over the world, from Muslim and non-Muslim researchers who have done extensive studies on the medical ethics of fasting. While improvement in many medical conditions was noted; however, in no way did fasting worsen any patients’ health or baseline medical condition. On the other hand, patients who are suffering from severe diseases, whether diabetes or coronary artery disease, kidney stones, etc., are exempt from fasting and should not try to fast.
There are psychological effects of fasting as well. There is a peace and tranquility for those who fast during the month of Ramadan. Personal hostility is at a minimum, and the crime rate decreases. ... This psychological improvement could be related to better stabilization of blood glucose during fasting as hypoglycemia after eating, aggravates behavior changes. ...
Obviously not fasting and then going to the gym and draining yourself, but the fast is a detox