The USDA<span> Center for Nutrition Policy and Promotion.</span>
I think it is natural selection. genetic variation also could be a factor for physical variation over the years.
Answer:
<em>Medical assistants are health care professionals who assist doctors in clinics and medical offices. They may show you to the exam room, take your vital signs, and check your height and weight. Their duties are limited to collecting information and preparing the doctor and patient for the medical visit.</em>
As you age, you realize that the way you eat might effect how long you live. Eating too much or too much bad things can give you lots of medical conditions, and you realize that as you get older.
