This work provides practical guidance for correcting both overweight and underweight through diet and exercise, emphasizing prevention and gradual, safe change under medical supervision. It identifies common causes of excess weight—reduced activity, overeating, and sometimes endocrine factors—and warns against advertised reducing drugs while recommending diets that favor bulky, low-fat foods and regular meals. Exercise advice includes daily calisthenics, brisk walking, outdoor activity, attention to bowel regularity, and hygienic measures such as baths. The section on underweight examines causes of malnutrition and prescribes targeted exercises and dietary adjustments to build weight sensibly, stressing persistence and individualized plans over quick fixes.