The very simple and direct conclusions I draw are these: First, if the Bible teaches us to do something, I want to do it. I want to obey the Lord in every way that He commands me to obey Him. And second, if fasting and praying are means to a breakthrough that God has for me, I want to undertake those disciplines so I might experience that breakthrough!
It appears that restricting calories activates genes that direct cells to preserve resources. Rather than grow and divide, cells in famine mode are, in effect, stalled. In this state, they are mostly resistant to disease and stress and enter into autophagy, a process of cleaning out dead or toxic cell matter and repairing and recycling damaged components.
A diagnostic fast refers to prolonged fasting from 8–72 hours (depending on age) conducted under observation to facilitate the investigation of a health complication, usually hypoglycemia. Many people may also fast as part of a medical procedure or a check-up, such as preceding a colonoscopy or surgery. Fasting may also be part of a religious ritual.