In addition to advising patients about the virtues of healthy eating, doctors should also push home the message about risks from obesity, inactivity, smoking and excessive drinking, said the paper.

In April, researchers at University College London found that eating seven daily portions or more could reduce the risk of cancer by 25 percent and of heart disease by 31 percent, compared to people who consumed less than one portion a day.

The study was based on the eating habits of more than 65,000 people in England between 2001 and 2008.

The London researchers admitted to being surprised by what they found and cautioned the results may not be applicable to other countries.

Britain has one of the highest rates of heart disease in Europe, a fact blamed in part on a diet high in fat and sugar.

The WHO guidelines are based on the equivalent of five 80-gram (three-ounce) portions. One portion is roughly equivalent to a medium-sized apple, a bowl of mixed salad or three dessert spoonfuls of raw, cooked, canned or frozen vegetables.

英国营养学家在四月份向既定的食谱指南发起挑战，宣称保持身体健康的关键是每日七种蔬果搭配而不是以往推荐的五种蔬果。

但是一项新的关于健康饮食的调查显示，联合国世界卫生组织（(WHO)）在2003年推荐的著名的每日五蔬果搭配是合理的。

中国和美国的研究者搜索了16种已经出版的饮食和健康调查，涉及到超过83万的参与者，这些人参与并接受了从4年半到26年不等的跟踪调查。

【研究：每日五蔬果 健康好身体】相关文章：

★ 囧研究：憋尿助你做出更佳抉择

★ 养生诀窍：每天3颗椰枣你的身体会变成这样

★ 研究发现：周末补觉补的是肥肉 损的是健康

★ 每日阅读的6大好处

★ 丹麦欲对北极提出主权要求

★ 在俄罗斯谈恋爱真累,网聊需要被监控

★ 研究：太快乐的人容易早死

★ 自产农产品对健康的好处

★ 研究表明:听悲伤的歌会让抑郁患者快乐

★ 研究：“男人不坏女人不爱”有道理