Ever wonder what the major nutrients found in each food group are. In no particular order, here they are...
Fruits: folate, vitamin A, vitamin C, potassium, fiber
Vegetables: folate, vitamin A, vitamin C, vitamin K, vitamin E, magnesium, potassium, fiber
Grains: folate, niacin, riboflavin, thiamin, iron, magnesium, selenium, fiber
Meat: protein, niacin, thiamin, vitamin B6, vitamin B12, iron, magnesium, potassium, zinc
Milk/Dairy: protein, riboflavin, vitamin B12, calcium, magnesium, potassium, (often fortified with vitamins A + D)
Oils- vitamin E, essential fatty acids
http://www.mypyramid.gov/ for more information on the US Dietary Guidelines. Be sure to check out the new and improved food pyramid; which can now be customized by entering in your age, sex, height, weight, and daily physical activity http://www.mypyramid.gov/mypyramid/index.aspx