Generally speaking, the nutritional value of purple foods is rather high. Nowadays, many nutritional experts advise people to increase the intake of foods in purple. The medical research has proved that the foods in purple can better resist aging and improve the physical health for the human body than other foods. 

The foods in purple contain a kind of natural pigment called “anthocyanins” which can effectively remove the free radicals from the human body so as to resist and defer aging. The anti-oxidation ability of anthocyanins is much higher than that of vitamin C and vitamin E. Among all the purple foods, blueberry contains the highest content of anthocyanins. Anthocyanins play an important role in resisting aging, preventing high blood pressure and improving the functions of eyes. Therefore, people who always use computers or read books should especially eat the purple foods. In addition, the purple foods contain abundant selenium. As a kind of trace element, selenium can enhance the immunity for the human body to prevent cancer.

There are various kinds of foods in purple for people to eat, such as nori, purple eggplant, grape, purple corn and so on. Nori contains abundant nutrients like protein, sodium, iron and calcium. It can effectively prevent the formation of thrombus and decrease the blood viscosity. Therefore, the patients with cardiovascular diseases should increase the intake of nori in everyday life. Purple eggplant also contains a large number of nutrients like vitamins and trace elements. Generally speaking, the eggplant in purple contains a higher nutritional value than the eggplant in other colors. The substances contained in purple grapes can resist the high blood pressure, decrease the blood fat and increase the density of vitamin E contained in blood plasma. The nutritional value of purple corns is rather high. The anti-oxidation agents like anthocyanins and lutein contained in the corns can protect the blood vessels and resist cancer. Purple potatoes contain 18 kinds of amino acid, 8 kinds of vitamins and 10 kinds of trace elements. In addition, the high content of cellulose contained in potatoes can improve the intestinal peristalsis and remove the wastes and toxins from the human body.

In fact, except the foods mentioned above, the purple foods are rather diverse. Although the purple foods contained extremely abundant nutrients, people should absorb the nutrients from the natural foods like dried fruit. Each kind of food plays different roles in improving the physical health for the human body. Therefore, people should maintain a balanced diet and get rid of the bad habit of being choosy in food.