For many years British people have been recommended to eat at least 'five-a-day' ? that isfive items of fruit or vegetables every day in order to improve their health and reduce thelikelihood of illness, in particular cancer.

　The recommendation was first put forward in 1990 by the World Health Organizationwhich said that the 'five-a-day' diet could prevent cancer and other chronic diseases.

　Since then the advice has been a mainstay of public health policies in many developedcountries, such as the UK, where the population eat a high proportion of junk food.

　Many health campaigns have promoted the advice, and indeed much food packaging inBritain states how the contents will constitute part of your five-a-day.

　However, a s