Synsepalum dulcificum is a West African plant that produces red berries commonly known as miracle fruit. A protein found in these berries can bind to the sweet taste receptors of the tongue. This causes many sour, acidic foods to taste sweet, and the effects may last for one to two hours. Miracle fruit has been proposed for use in taste changes caused by chemotherapy and for weight loss, but studies are quite limited. Data suggest that some patients undergoing chemotherapy reported improved taste, but no change in weight with miracle fruit.