Chances are you have a family member, close friend, or colleague who has diabetes. (That person might even be you.) This chronic and serious health condition affects about one in ten people, and that number rises with age—half of all adults in the United States have diabetes or prediabetes, reports the American Diabetes Association.

We are mostly talking about type 2 diabetes here because it’s, by far, the most common form of the disease, accounting for about 90 to 95 percent of all cases. (Type 1 diabetes and gestational diabetes are the other main types.)

What all types of diabetes have in common is that people have blood glucose—blood sugar—that is too high. Does that mean that eating sugar causes diabetes? The answer for type 1 diabetes is always no—this comparatively rare type of diabetes is an autoimmune condition that is unrelated to lifestyle factors like food intake or exercise.

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