The food guide pyramid, informally known as the food pyramid, and formally titled the Improved American Food Guide Pyramid is a historical nutrition guide published in 1992 by the USDA to replace the earlier food groups classification system. The food guide pyramid suggested optimal nutrition guidelines for each food category, per day, using a mnemonic graphic of a pyramid with horizontal dividing lines, to represent suggested percentages of the daily diet for each food group. The food guide pyramid was superseded by the current USDA nutrition advisory program titled "MyPyramid" in April 2005.

Take a deep breath, swallow hard, and follow the food you eat on its day-long journey through the digestive system.

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Although humans are omnivores, each culture holds some food preferences and some food taboos. Individual dietary choices may be more or less healthy. Proper nutrition requires vitamins, minerals, and fuel in the form of carbohydrates, proteins, and fats. Dietary habits play a significant role in the health and mortality of all humans.