Whole grain bread, which is increasing in consumption in the United States and other Western countries, is not white in color but is nutritious. Dietary fiber is good for the body, how much daily intake is appropriate, there have been a number of recommendations, very inconsistent, because of a number of factors, some of which are not fully understood. For reference, the previously mentioned figure of 33.3 grams per day for Chinese is good, while 11.1 grams per day for Americans is inadequate. Some suggest 20-30 grams per day, which is more moderate. The content and nature of dietary fiber in plant foods varies according to species, growing conditions, degree of maturity and other factors. Food composition table listed in the "crude fiber" item, with acid, alkali treatment of the remaining part of the sample, much lower than dietary fiber, only half of its or lower, the two are different, can not be mixed. Dietary fiber is measured enzymatically. Cereal foods contain the highest dietary fiber, about 6% of whole wheat flour, refined flour 2%, brown rice 1%, refined rice 0.5%, 3% of vegetables, fruits 2%. People can not calculate the daily meal fiber intake, but often eat more grains, vegetables, fruits, etc., to keep the bowels free.

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