Coffee Substitute with recipe

Shawn, 43, writes me "I have difficulty with the acid in coffee and have been searching for a substitute. I am also predisposed to diabetes. Dandelion interested me because of it affect on pancreas and liver function, but if it is used for constipation well...My question is... coffee drinkers tend to drink alot of coffee so, at what amount does dandelion coffee become harmful and how would it affect the bowel and other systems of the human body?"Coffee...