Why do teens need to eat more from the grains, fruits and vegetables food groups?

Each group of foods (grains, fruits, and vegetables) enable teens to grow healthily, as these foods provide the sufficient nutrients and vitamins needed to do so. Grains provide fiber, b vitamins, and minerals, reducing the chances of becoming chronically ill. Vegetables and fruits are natural sources that provide essential vitamins for humans to live and grow (such as vitamin a and vitamin c). Vegetables and fruits are rich in these nutrients, as they help maintain a healthy blood pressure, their dietary fibers lowering the risks of heart disease, and also maintains (or boosts even) the health of our eyes, skin, and other essential parts of the body as well.

the last statement is correct i.e.

when your heart is not pumping enough blood around your body because your heart is severely failing, you may need an artificial heart. an artificial heart is a mechanical device, about the size of an orange, that is connected to your heart or implanted in your chest to or replace a failing heart.