Why do you feel sick after not eating for a long period of time?

Answer:
you feel sick because your stomach is empty so it is sending signals to your brain. it is also sending gases while sending signals. the gases in your stomach are acidic so when they go up your esophagus, they make you sick.

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your stomach is also digesting itself slowly

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Not eating is fasting. After fasting a while, your body goes into a super cleansing mode. To get rid of toxins in you it must put them back into your blood.

Fasting is used to cure all sorts of health problems and lose weight. Site below has quotes from 17 MDs explaining what you asked about in a more scientific way.

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glucose levels go down. body and brain need glucose to function.

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