Grapes are delicious and nutritious, and I'm sure many of you love them. There are many different varieties of grapes, but I don't know if you've ever noticed, but no matter what the variety, there is a layer of "white frost" on the surface. It is this "white frost" that has caused so much controversy.

The white frost on grapes is not a pesticide residue, it is called fruit powder, which is a sugar alcohol secreted by grapes during the growth process. In fact, not only grapes, but also plums, sugar cane, blueberries and other fruits and melons have this layer of "white frost" on their surface. The amount of powder, or "white frost", reflects the quality of the grapes, and the thicker the powder, the better the quality of the grapes.

The white frost on the grapes is not only harmless to humans, but also has a number of useful effects. For example, it protects the fruit by reducing water evaporation, preventing rapid water loss and shrinkage after picking, and has a positive effect on adaptation to dry conditions; it also protects against disease.

So, it's okay to wash grapes with white frost, as it is not harmful to our health. If you still feel uncomfortable eating them, you can wash them with the help of flour, which will make them cleaner.

You should eat no more than 20 grapes a day. Grapes are rich in vitamin C and contain a lot of water and sugar. Eating grapes regularly strengthens the immune system and has a diuretic and detoxifying effect.

Before eating grapes, you should pay attention to the following two things.

Drinking water immediately after eating grapes can cause diarrhoea. The grapes themselves have a laxative effect, so if you drink water immediately after eating grapes, it will reduce the concentration of stomach acid, and the stomach will not be able to digest the grapes while the grapes are fermented with water and stomach acid in a rapid oxidation process, accelerating the peristalsis of the stomach and intestines, which will easily produce diarrhoea.

In this case, however, there is no need to take any diarrhoea medication, as the diarrhoea can be cured afterwards, but it is better to eat less during the process.

You should not drink milk immediately after eating grapes. Grapes contain vitamin C, and the elements in milk will reflect with the vitamin C contained in grapes, which is harmful to the stomach. Therefore, you should not drink milk after eating grapes. Usually you should drink milk half an hour after eating