Every five years the USDA reviews the nutrition advice in the Dietary Guidelines for Americans. This document sets the standards for all federal nutrition programs, such as the school lunch program, and also can influence what foods people buy. That's why the food industry and nutrition experts are all interested in seeing how the guidelines might be changed. It was last reviewed in 2005, and will be reviewed again in 2010. In 2005, there were several changes. Instead of just saying that all dietary fats are bad, the suggestion now is that trans fats should be avoided, and saturated fat should be limited, but a person can get between 20 and 35 percent of their daily calories from monounsaturated and polyunsaturated fats. The new guidelines also suggest that people limit their intake of sugar, and try to increase their intake of whole grains.