What are the problems of the typical American diet?

Answer 1

Too many calories - in the form of fats and sugars, primarily.

Most people in the United States and other developed countries get plenty of macro-nutrients in their diets. They may eat too much protein, too many carbohydrates, and too much fat, but deficiencies in macro-nutrients are rarely a problem. The problem in the United States and other industrialized nations is primarily micro-nutrient deficiency: to few vitamins, minerals, and phytonutritents.

Too few vegetables and fruits:

In the U.S., one third of all adults get less vitamin C from their diet than is recommended by the National Academy of Sciences, and 1 out of every 6 adults gets less than half the amount recommended.