Our expert says:
If an individual goes on a total fast (no food, no liquids with any nutritive value, only water), then the digestive system does shut down. A good example of this is when someone undergoes a major operation and does not eat any food for a few days. Once such a patient has to be reintroduced to eating, she is given a light diet (jelly, soup, etc) for a day or two, followed by a gradual introduction to normal foods. However, I have not heard that the non-functioning of the digestive system during a fast causes insomnia. It is quite possible that your friend could not sleep because she was so very hungry and her tummy may have been growling and rumbling.
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