LONDON, UNITED KINGDOM - MAY 23:  Fruit and vegetables are displayed for sale at a grocers shop on May 23, 2014 in London, United Kingdom. Researchers at University College London recently said that eating 'five-a-day' of fruit and vegetables should be increased to seven. The study involving 65,226 men and women concluded that lifestyles which included at least seven-a-day reduced the chances of serious health issues.  (Photo by Christopher Furlong/Getty Images)