What can I do to improve my blood circulation?

I’ve recently noticed that my fingertips num easily. I come from a family with a history of diabetes and high cholesterol. I recently went to the doctor and there is nothing really wrong with me except I have a very high risk of becoming diabetic. Is there anything I can do to improve my blood circulation? I heard a glass of red wine a day is good but I don’t know if it’s true. Any suggestions?