Charles Lieber (1931-2009)
Lieber was a Belgian-born American researcher who pioneered alcohol research at a time when conventional wisdom thought alcohol was not toxic and that cirrhosis was caused by a faulty diet.
nutrient
Denis Burkitt (1911-1993)
Denis Burkitt was an Irish missionary surgeon in Africa whose observation that populations on that continent who ate high-fiber diets were protected from colon cancer and other chronic diseases helped lead to the belief that dietary fiber is an essential component of a healthy diet.