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May 31 2011 12:00 AM

For the last two decades the federal government has used the Food Pyramid as the basis for good nutritional advice, which never told people how much of which types of foods they should eat. Many also criticized it for not taking into account the impact on insulin of some high carbohydrate foods.

The food pyramid is giving way to a simple, plate-shaped icon, which is sliced into portions for basic food groups - fruits and vegetables take up half the space. The plate symbol will be announced by Agriculture Secretary Tom Vilsack on Thursday.

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