You know eating fruit and vegetables is good. But did you know it can also make you look good?

People who increased their intake2 over just six weeks developed a healthy glow and appeared more attractive, researchers found.

Scientists at St Andrews University found eating them subtly increased yellow and red pigments in the volunteersskin.3 They monitored the food intake of 35 people and took pictures of their faces, arms and hands using a sensitive camera at the start, and after three and six weeks. Increasing their intake of greens by 2.9 portions a day was found to make the person look more healthy and an extra 3.3 portions could enhance their attractiveness, when their photographs were rated by others.

Fruit and vegetables are rich in carotenoids, which are known to protect against cell damage from pollution and UV rays,4 and can also prevent age-related diseases including heart disease and cancer. But while it was known eating extreme amounts of certain vegetables such as carrots could turn skin orange, it was not known a small increase was perceptible to others—and was seen as appealing.5

A camera measured changes to the skins redness, yellowness and lightness, and found it significantly changed in people who naturally increased their intake. These changes were not evident at three weeks. Using light sensors, the researchers showed these red and yellow hues were linked with the levels of carotenoids in their skin.6

There are hundreds of carotenoids but those thought to have the most dramatic effect are lycopene—which gives tomatoes and red peppers their red colour—and beta-carotene found in carrots as well as broccoli, squash, and spinach.7

Skin colour is also affected by chemicals called polyphenols, found in apples, blueberries and cherries,8 which cause blood rush to the skin surface.

1. veg:〈英〉蔬菜。

2. intake:（食物、飲品等的）攝入量。

3. subtly: 細(xì)微地，隱約地；pigment: 色素。

4. carotenoid: 類胡蘿卜素；UV ray: 紫外線。

5. perceptible: 可察覺的；appealing: 吸引人的。

6. light sensor: 光傳感器；hue: 顏色，色調(diào)。

7. 類胡蘿卜素有數(shù)百種，但對(duì)皮膚顏色影響最顯著的據(jù)認(rèn)為是番茄紅素和β-胡蘿卜素。西紅柿和紅辣椒的紅色都源自番茄紅素，β-胡蘿卜素則可以在胡蘿卜、花椰菜、南瓜和菠菜中找到。

8. polyphenols:〈化〉多酚；blueberry: 藍(lán)莓。