What happens to your body when you fast for 16 hours?

Online Answer
This may lead to weight gain, digestive problems and the development of unhealthy eating habits. 16/8 intermittent fasting may also cause short-term negative side effects when you're first getting started, such as hunger, weakness and fatigue — though these often subside once you get into a routine.
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The research looked at both mice and humans.
Generally, you don't need to fast before doing a thyroid function test. However, not fasting is sometimes linked to a lower TSH level. This means your results might not pick up on mild (subclinical) hypothyroidism — where your TSH levels are only mildly elevated.
Fasting for a few days probably won't hurt most people who are healthy, provided they don't get dehydrated. But fasting for long periods of time is bad for you. Your body needs vitamins, minerals, and other nutrients from food to stay healthy.
To maintain a healthy intermittent eating regimen, avoid these foods: — Snack chips. — Microwave popcorn. You should also avoid foods that are high in added sugar.
Fasting for 72 hours can reset your entire immune system (The Source) The Source featured research by Valter Longo of the USC Leonard Davis School on how fasting for three days can improve a person's health. The six-month study was done on subjects going through chemotherapy.