Lemon contains photosensitive substances, but it needs three conditions to produce photosensitive reaction: first, it needs special physique, second, it needs enough light time, and finally the content of photosensitive substances must meet a requirement.

Some scientists have done relevant experiments, and the conclusion is: if your body is normal, you need to eat 300 lemons, and then the sun will turn black after 300 hours of exposure! So it is false to drink lemonade in the morning and turn black.

Extended information: Precautions for drinking lemonade:

1, lemonade is not the better. Drinking a lot of lemonade every day will not only fail to whiten and slim down, but will harm the gastrointestinal function. Under normal circumstances, the daily intake of lemonade should not exceed 1000 ml.

2. People who are prone to slight cold stomach acid, it is best not to drink lemonade at night. It is recommended to drink it one hour after dinner at night, and it will be better to add some honey.

But lemon and vinegar are very acidic. Drinking too much on an empty stomach will hurt your stomach, so be careful when you try.

Reference: Baidu Encyclopedia Lemonade