During a fast, the body produces few new proteins and requires cells to take protein from nonessential sources, break them down and use the amino acids to make new proteins, vital for survival. Then, after eating, new proteins are formed in the brain and elsewhere.

To lose weight, strive for sixteen calorie-free hours. Stop eating by 8 pm, and eat again at noon the next day. Results can take up to four weeks to notice.

It can take 10 to 12 hours to use up calories in the liver before your body changes over to use the stored fat.

Fasting means abstinence of some or all food for a period of time.

Human studies of intermittent fasting revealed that it improved disease indicators such as insulin resistance, blood fat abnormalities, high blood pressure, and inflammation.