Kwashiorkor is a form of severe protein malnutrition that most commonly affects children in areas impacted by drought or famine. It is caused by a diet inadequate in protein despite sufficient calorie intake. Symptoms include swelling, skin changes, hair and nail abnormalities, lethargy, and slowed growth. Treatment focuses on gradually increasing protein and micronutrient intake while addressing medical complications like infections. Preventing kwashiorkor requires a well-balanced diet containing sufficient protein, carbohydrates, and fat.