Lemon contains more citric acid than other citrus fruits. In fact, the citric acid content is about 8% of its dry weight. I don't know how much this citric acid affects the body, but it does have a protective effect on the fruit itself, which helps to prevent browning and maintain the sharp citrus flavor in this juice. ?
Lemon buying skills
When choosing lemons, you should take a look at the skin of lemons and choose golden yellow, uniform, bright and full ones, because such lemons show that the sun exposure time is relatively uniform, so don't choose too red ones. This kind of lemon has high maturity and bad taste.
It should be noted that the surface of lemon peel must be very smooth, and there should be no cracks and insect eyes on the surface of lemon. If not, then don't buy it.
The above contents refer to Baidu Encyclopedia-Lemon