Someone believe it's deit that he/she has nothing to eat. This idea is risky. His/her brain is unable to function normally in the situation. Of course, the body is,too.
Reckless diet comes the risk becoming Type 2 diabetes. Diabetes needs diet which is the medical treatment.
The best way of my real experience in past time is having supplements (which are“storng wakamoto”and “ascorbic acid”).
Course the exercise is effective,too.
The first is the sufficient nutrition to keep the body in shape.
The Japanese old words said,“Nobody can fight as hungry.(“Hara ga hettewa ikusa ga dekinu.”)
Is it strange to use the words as a metaphor ?