<P> All percentages are percentages of calories, not of weight or volume . To understand why, consider the determination of an amount of "10% free sugar" to include in a day's worth of calories . For the same amount of calories, free sugars take up less volume and weight, being refined and extracted from the competing carbohydrates in their natural form . In a similar manner all the items are in competition for various categories of calories . </P> <P> The representation as a pyramid is not precise, and involves variations due to the alternative percentages of different elements, but the main sections can be represented . </P> <P> The USDA food pyramid was created in 1992 and divided into six horizontal sections containing depictions of foods from each section's food group . It was updated in 2005 with colorful vertical wedges replacing the horizontal sections and renamed MyPyramid . MyPyramid was often displayed with the food images absent, creating a more abstract design . In an effort to restructure food nutrition guidelines, the USDA rolled out its new MyPlate program in June 2011 . My Plate is divided into four slightly different sized quadrants, with fruits and vegetables taking up half the space, and grains and protein making up the other half . The vegetables and grains portions are the largest of the four . </P> <P> A modified food pyramid was proposed in 1999 for adults aged over 70 . </P>

Where do beans go on the food pyramid
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