A compound called lupeol, which is found in mangoes, grapes, strawberries, vegetables, olive seed, figs and saw palmeto, has been found to slow or kill the growth of cancer cells in the nose, oral cavity, throat, voice box, thyroid and salivary glands, according to research at the University of Hong Kong. Such cancers are typically caused by "smoking, excessive alcohol consumption, chewing betel nut and diets rich in preserved foods, like salted fish," according to a Reuters article.