In fact, what to drink can maintain good health, lose weight, harmful to the body, and so on, basically belong to pseudo-propositions. Many things do not lie in good or bad, but in degree. It's the same with coffee.
Some time ago, I was in the hospital with digestive syndrome. The first few asked how to protect my stomach. "can I have tea?" the doctor said, "Yes. But not too strong. " Although this estimate has not been scientifically demonstrated, we still have to listen to what the doctor says.
I was going to ask if I could have coffee? But when you think about it, since the tea is light, not to mention coffee. In the past, it was often super-strong, but now we learn from Japanese coffee and Korean coffee. If you drink it lightly, you will be healthier and more able to taste the natural taste.