At age 16 Tua has an appropriate weight and eats whatever he wants. What is the best strategy for Tua to ensure good health?

A. Walk once a day and start paying attention to his diet to prevent weight gain.

B. Engage in regular physical activity and get in the habit of eating food that is high in nutrients.

C. Take up an aerobic sport like soccer and reduce his calorie intake to 1800 per day

D. Just keep doing what he has been doing