What happens to your liver when you fast?

Online Answer
After about 8 hours of fasting, the liver will use the last of its glucose reserves. At this point, the body enters into a state called gluconeogenesis, marking the body's transition into fasting mode. Studies have shown that gluconeogenesis increases the number of calories the body burns..
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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.