How are ketones formed in the body and what role do they play in metabolism?

Ketones are formed in the body when there is a shortage of glucose for energy. This typically happens during fasting, low-carb diets, or Diabetes. Ketones are produced from fatty acids in the liver and can be used as an alternative fuel source for the brain and muscles. They play a crucial role in metabolism by providing energy when glucose levels are low, helping to preserve muscle mass, and promoting fat burning.