Peanut butter is a food paste made primarily from ground roasted peanuts, with or without added oil. It is popular throughout the world and is also manufactured in some emerging markets. Its primary use is as a sandwich spread.

Similar peanut pastes are popular in various cultures. In South Indian cooking, chili peppers are added to make a spicy variant of peanut paste. In some types of gourmet peanut butter, chocolate or other ingredients may be added. In Andhra Pradesh, India, peanut chutney is popular. In this variation, peanuts are ground and mixed with chili peppers and other ingredients.

Various nut butters are also made from other nuts.

History

Peanuts, which are native to the New World tropics, were mashed into paste by Aztecs hundreds of years ago.

Evidence of modern peanut butter comes from US patent #306727 issued to Marcellus Gilmore Edson of Montreal, Quebec in 1884, for a process of milling roasted peanuts between heated surfaces until the peanuts reached "a fluid or semi-fluid state." As the product cooled, it set into what Edson described as "a consistency like that of butter, lard, or ointment."

In 1890, George A. Bayle Jr., owner of a food business in St. Louis, manufactured peanut butter and sold it from barrels.

J.H. Kellogg, of cereal fame, secured US patent #580787 in 1897 for his "Process of Preparing Nutmeal," which produced a "pasty adhesive substance" that Kellogg called "nut-butter."

Health benefits

Peanut butter provides protection against cardiovascular disease due to high levels of monounsaturated fats and resveratrol; butter prepared with the skin of the peanuts has a greater level of resveratrol and other health-aiding agents. Peanut butter (and peanuts) provide protein, vitamins B3 and E, magnesium, folate, dietary fiber, arginine, and high levels of the antioxidant p-coumaric acid.

Plumpy'nut is a peanut butter based food used to fight malnutrition in famine stricken countries. A single pack contains 500 calories, can be stored unrefrigerated for 2 years, and requires no cooking or preparation.

In the novel Make Room! Make Room! by Harry Harrison, and the film Soylent Green, based on the novel, an impoverished and malnourished world is portrayed; the government supplies a peanut butter ration to prevent "the kwash" (kwashiorkor, associated with protein deficiency) in children.

Health concerns

For people with a peanut allergy, peanut butter can cause reactions including anaphylactic shock which has led to its banning in some schools.