More than 30 million Americans have type 2 diabetes, and 7 million of them don’t know it, according to the Centers for Disease Control and Prevention (CDC). Diabetes is serious business. It can lead to heart disease; stroke; kidney failure; vision loss; amputation of toes, feet or legs; and premature death. The good news is that you can often manage diabetes with physical activity, diet, insulin and other medications. Marjorie Lang, a diabetes educator at Lake Health, knows how important it is to see if you're at risk.