Pu 'er tea can lower blood sugar. I won't go into details, because you have a lot of information on Baidu. Its effect is absolutely the best, and it can be drunk for a long time and is very effective. As long as you avoid half an hour before and after taking the medicine, it will have no effect.

If you drink, you can drink less at night after lunch, that is, in the afternoon, the elderly generally can't sleep well. But according to my experience, Pu 'er tea will not cause insomnia.