Because patients who are in a coma can't eat or drink on their own, they receive nutrients and liquids through a vein or feeding tube so that they don't starve or dehydrate. Coma patients may also receive electrolytes -- salt and other substances that help regulate body processes.

Do you not eat when in a coma?

A food coma is caused by eating a lot of food. Your body is focusing most of its energy on digesting the huge amount of food you just downed. So clearly, the best way to not fall victim to a food coma is to eat less.

How long can a coma patient live without food and water?

If you stop eating and drinking, death can occur as early as a few days, though for most people, approximately ten days is the norm. In rare instances, the process can take as long as several weeks.