Here’s some advice from the MedHelp website and our Sugar Sense app on drinking coffee when you have diabetes. Hope this helps you!
http://www.medhelp.org/diabetes/articles/Is-Coffee-OK-to-Drink/2490
You can find this on the app by going to the home screen, and clicking the menu bar in the upper left corner. Tap Health Guide, then scroll to Food Facts. Scroll down for this and other articles related to diabetes and specific foods.