Fasting

Liquid fasting
Some fasts include abstaining from solid foods but consuming calorie-containing liquids, such as vegetables juices or broth.

Physiological effects
Fasting puts the body into a fat-burning mode called ketosis. Fasting also increases autophagy.

Health effects
There is no evidence on the benefits or harms of fasting for ME and CFS patients. However, there is a growing body of evidence suggesting possible health benefits of water only fasting to the microbiome, mitochondria and the immune system , and as a cancer adjuvant

Immune system
Caloric restriction significantly reduced the amount of circulating lipopolysaccharide-binding protein.