Evidence for the manifold benefits of green tea continues to mount. Recent studies have shown a significant preventive effect against colorectal and oral cancer in women who drank green tea regularly, and a 48% reduction in risk of developing advanced prostate cancer in men who drank five or more cups a day (over 14 years). Green tea extract may also be a promising treatment for skin disorders such as psoriasis and for preventing lethal bacterial sepsis. Meanwhile black tea appears to decrease bone loss in elderly women, reduce plasma glucose concentrations and stimulate insulin production, and have favourable effects on markers of coronary heart disease.