Superfood is a marketing term for food assumed to confer health benefits resulting from an exceptional nutrient density. The term is not commonly used by experts, dietitians and nutrition scientists, many of whom dispute that particular foods have the health benefits claimed by their advocates. Even without scientific evidence of exceptional nutrient content, many new, exotic, and foreign fruits or ancient grains are marketed under the term – or "superfruit" or "supergrain" respectively – after being introduced or re-introduced to Western markets.