People can generally live about 1 month without eating and drinking only water, but some studies have also shown up to 3 months, but its only an extreme study and challenge and not recommended to be tested in a population. The nutrients that a person normally needs on a daily basis include glucose, fat, protein, and electrolytes and water. When a person does not eat, the aforementioned nutrients are not available. Without sugar intake, the human body relies on fat and protein in the body to provide energy, burning the fat in the body or burning the protein and providing it as calories. However, drinking water alone can ensure hydration, but not electrolyte intake, and after a long time the patient will suffer from hyperhydrosis, heavy depletion, electrolyte disorders, and eventually death.