Which is a smart food choice according to the dietary guidelines for americans

Determining low-fat or non-fat milk and milk goods.

Explanation:

As you age, you typically need fewer calories a day. Youngsters require the maximum calories, but as they grow, their metabolism slows and they need fewer calories per day. Generally, though, the equivalent ratio of fats to carbohydrates to protein is yet supported. Some researches have found that aged people are generally less willing to use fewer protein-rich meals, so it's necessary to manage a steady diet and make sure variations in dietary choices don't appear in lacks. A greater fiber food could also help manage a constant conversion pattern as people age, though young people can also profit from high fiber food as well.

b) the heart is a pump made of muscle and that is difficult to grow in the lab.