stevia (sweetener), sweetener made from the leaves of the South American plant Stevia rebaudiana and used as a replacement for sugar.
Refined stevia is classified by the U.S. Food and Drug Administration as a nonnutritive sweetener. It contains a number of natural compounds, including stevioside and rebaudioside A, that can be more than 300 times sweeter than sucrose from sugarcane and sugar beets.
Unrefined stevia leaves have been used for centuries by the Guaraní people in the lowland jungles where Brazil and Paraguay meet. Stevia first enjoyed popularity as an export item in the 1970s, when large quantities of the sweetener, highly refined, were exported to Japan, which has remained a large market for the product even as other nations have also taken to using it. Stevia is also widely sold in other East Asian countries and in India. Stevia is approved for sale in the United States and Canada despite some resistance among nutritionists and medical researchers, and a ban against it was lifted in the European Union in 2011.
Stevia sweeteners carry health cautions, particularly for pregnant or nursing women, since the effect of stevia on birth weight and other factors is not well documented. It is known to be poorly absorbed by the body, which has consequences both positive and negative: with no calories, it may enhance weight loss among dieters, but it also may have negative effects of the growth of healthy gut microbiota. Some studies suggest that instead of aiding diet, however, stevia increases levels of short-chain fatty acids in the colon that are implicated in higher levels of body fat and obesity. Refined stevia is also associated with nausea among a high percentage of consumers.
Stevioside is believed to have antitumour, antifungal, and antimicrobial properties that may lend the plant to use in treating circulatory and liver disorders. However, more clinical studies are required in all these regards.