Why is drinking red wine good for health?

Drinking red wine is good for the elderly, which can not only prevent various diseases, but also soften blood vessels. Drinking before going to bed can also help them fall asleep. But now I have changed the red wine for my parents into purple wine. Purple wine is made of mulberry, which belongs to berries, but the nutrition of mulberry is four times that of grapes. It's all about drinking. Of course I want the best for my parents.