When a person does not eat for a long period, it is called starvation. Starvation occurs when the body does not receive enough nutrients, particularly calories, to maintain basic bodily functions. This can lead to severe physical and psychological effects, including weight loss, muscle atrophy, immune system suppression, and organ failure if prolonged. Starvation can result from various factors, including food scarcity, eating disorders, chronic illness, or extreme diets. It's crucial to address the underlying causes of starvation and provide proper nutrition to prevent serious health complications and promote recovery.