Beans and pulses also count, but again only as one portion as they contain fewer nutrients than other fruits and vegetables.

Smoothies may count towards more than one portion if they contain all the edible pulped fruit or veg, and depending on their ingredients.

Recommendations include frozen fruit and vegetables, and dried fruit, such as currants, dates, sultanas and figs.

Those in ready-meals and shop-bought pasta sauces, soups and puddings are also included, but advice urges "only to have them occasionally" or in small amounts as they are often high in salt, sugar and fat.

What about potatoes?

Potatoes do not count towards one of the five-a-day, but sweet potatoes do.

Potatoes are not one of the five-a-day items. This is because they mainly contribute starch to a healthy diet, which is a good source of energy and helps digestion.

They are classified in the same group as bread or pasta by the government.

Skins should be left on when cooking as they are a good source of fibre.

But sweet potatoes, parsnips, swedes and turnips do count as five-a-day foods, as they are usually eaten as well as the starchy bit of the meal.

据英国广播公司报道，专家表示，吃各种水果蔬菜对身体最为有利，可以均衡饮食，预防疾病。

研究表明，一天至少吃7份水果蔬菜比政府目前提倡的一天五份可以更有效预防疾病。

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