The term has no official definition by regulatory authorities in major consumer markets, such as the United States Food and Drug Administration and Department of Agriculture or the European Food Safety Authority. It appears to have been first used in a Canadian newspaper in 1949 when referring to the supposed nutritional qualities of a muffin. In the late 20th and early 21st centuries, the term "superfood" was used as a marketing tool for selling specific foods, dietary supplements, foods with selected food additives, and self-help books about fad diets, promising an enhancement to health. "Superfood" products were sold at a higher price than similar foods not marketed with the label. The purported health benefits and effects of foods described as "superfoods" are unsupported or disputed by scientific studies.