At age 16, Juana has an appropriate weight and eats whatever she wants. What's the best strategy Juana can use to ensure good health?

Answer Choices:

• walk once a day and start paying attention to her diet to prevent weight gain
  
• engage in regular physical activity and get in the habit of eating food that is high in nutrients
  
• take up an aerobic sport like soccer and reduce her calorie intake to 1800 per day