<P> Oatmeal is popular in the United States however, cereal and oatmeal are not as popular as they used to be due to other portable options . Cereal in the United States is no longer the desired breakfast it once was . A widely popular cereal in the United States is Cheerios, part of the General Mills production . Wheat - based cereals (Cream of Wheat, Malt - o - Meal, Wheatena, etc .) are widely available if less popular . Grits is a porridge of Native American origin made from corn (maize) which is popular in the South . </P> <P> Breakfast cereal companies make gluten - free cereals which are free of any gluten - containing grains . These cereals are targeted for consumers who suffer from gluten - related disorders, as celiac disease, non-celiac gluten sensitivity and wheat allergy, among others . Some companies that produce gluten - free cereals include Kellogg's, General Mills, Nature's Path and Arrowhead Mills . </P>

Where did the idea of cereal and milk come from