Oranges are sour and sweet. Many people think that eating one after eating helps digestion, but they don't know that oranges also contain a lot of carotene. If you eat too much at one time or eat too much continuously in the near future, the concentration of carotene in the blood is high, which will lead to yellowing of the skin.

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Oranges are mainly divided into sweet orange, navel orange, blood orange, sugar orange and red orange.

In China, young fruits and fallen fruits can be dried and used as medicine. Storage and transportation resistance. The maturity varies greatly, which can prolong the supply period of fresh fruit and processing raw materials. Citrus varieties can be divided into early, middle and late maturity according to fruit maturity.

In view of the high degree of commercialization of citrus, many unique varieties have been born under the market demand, such as late-maturing summer orange to fill the market gap, seedless orange, Gannan navel orange and other geographically protected fresh food species. Many kinds of oranges are named after the place of origin, and some oranges are even registered with trademarks.

Tips for purchasing oranges: First of all, oranges are not as smooth as possible. Imported oranges are often rough and rough, while the oranges after "beauty" are very smooth and have almost no holes; Secondly, you can wipe the surface of the fruit with a white napkin before buying, preferably a wet tissue. If you draw, you usually leave color on the napkin.

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