How much should a 5'8 15 year old weigh?

About 140 Lb. The normal ranges from 125 to 160 lbs. A 15 year-year-old should aim for the lower end. Have a diet rich in fresh vegetables, fruits, whole grains, low fat milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco or alcohol in any form.