http://www.ucl.ac.uk/news/news-articles/0414/010413-fruit-veg-consumption-death-risk
FONT: UNIVERSITY COLLEGE LONDON
http://www.theguardian.com/uk-news/2014/apr/01/fruit-and-vegetables-seven-portions-ucl-study
FONT: THE GUARDIAN
http://www.lavanguardia.com/vida/20140401/54404609593/el-consumo-de-7-piezas-de-frutas-y-verduras-al-dia-alarga-la-vida.html
FONT: LA VANGUARDIA