People in the north eat sweet potatoes during the summer heat.

Food refers to substances that can meet the body's normal physiological and biochemical energy needs and extend normal life span.

For the human body, substances that can meet the needs of normal life activities and help extend life are called food.

Food is usually composed of carbohydrates, fats, proteins, and water. It is a substance that can provide nutrition or pleasure to humans or organisms through eating or drinking.