Based on this evidence, the US Department of Agriculture's (USDA) 2010 dietary guidelines recommend that Americans consume at least three servings of whole grain products daily, and the new US national school lunch standards require that at least half of all meals be whole grain-rich. However, no single standard exists for defining any product as a "whole grain".
From two major US grocers, researchers identified a total of 545 grain products in eight categories: breads, bagels, English muffins, cereals, crackers, cereal bars, granola bars, and chips.
