In my opinion, fruits and vegetables are the most important level of the food pyramid. Although people can argue that proteins is the most important, fruits and vegetables can't make you overweight or unhealthy if you eat more than the recommended portion. When the new food pyramid wasn't created yet, people were going by the old food pyramid, which had proteins as the biggest and most important part of the food pyramid. That led many Americans to obesity, which is why the new food pyramid was created: to help people better understand how many servings of each level they should be eating. Fruits and vegetables are most important because they contain carotenes, which enhance our immune systems and helps against diseases. Fruits and vegetables also provide fiber, nutrients, minerals and vitamins, such as Vitamin A, which is good for eyesight and growth, and Vitamin C, which is good for protection against viruses and bacteria and healing wounds.
Sources: http://www.netdoctor.co.uk/health_advice/facts/vitamins_which.htm
http://pediatrics.about.com/od/foodpyramid/a/05_food_pyramid.htm
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