The document discusses health and disease from perspectives of Ayurveda, WHO, and naturopathy. It defines health and outlines the digestive system. Junk food is described as having little nutritional value but plenty of calories, salt, and fat, increasing risks of obesity, heart disease, diabetes, and other chronic diseases. Junk food can also cause memory, learning, and mental health problems. The document recommends treating disease by returning to nature through a proper diet, nutrition, exercise, hydration, sleep, and following rules of Aroghya Raksha Panchatra including two meals a day, two liters of water, daily prayer, exercise, and weekly fasting.