If type 2 diabetes was an infectious disease, passed from one person to another, public health officials would say we’re in the midst of an epidemic.

This difficult disease, once called adult-onset diabetes, is striking an ever-growing number of adults. Even more alarming, it’s now beginning to show up in teenagers and children.

The problems behind the numbers are even more alarming. Diabetes is the leading cause of blindness and kidney failure among adults. It causes mild to severe nerve damage that, coupled with diabetes-related circulation problems, often leads to the loss of a leg or foot. Diabetes significantly increases the risk of heart disease

The good news is that type 2 diabetes is largely preventable. About 9 cases in 10 could be avoided by taking several simple steps: keeping weight under control, exercising more, eating a healthy diet, and not smoking.

Type 1 diabetes

Our cells depend on a single simple sugar, glucose, for most of their energy needs. That’s why the body has intricate mechanisms in place to make sure glucose levels in the bloodstream don’t go too low or soar too high.
When you eat, most digestible carbohydrates are converted into glucose and rapidly absorbed into the bloodstream. Any rise in blood sugar signals the pancreas to make and release insulin. This hormone instructs cells to sponge up glucose. Without it, glucose floats around the bloodstream, unable to slip inside the cells that need it. Diabetes occurs when the body can’t make enough insulin or can’t properly use the insulin it makes. One form of diabetes occurs when the immune system attacks and permanently disables the insulin-making cells in the pancreas. This is type 1 diabetes, once called juvenile-onset, or insulin-dependent, diabetes. Roughly 5 to 10 percent of diagnosed diabetes cases are type 1 diabetes.

Type 2 diabetes

The other form of diabetes tends to creep up on people, taking years to develop into full-blown diabetes. It begins when muscle and other cells stop responding to insulin’s open-up-for-glucose signal. The body responds by making more and more insulin, essentially trying to ram blood sugar into cells. Eventually, the insulin-making cells get exhausted and begin to fail. This is type 2 diabetes.

Prediabetes

This early warning sign is characterized by high blood sugar levels on a glucose tolerance test or a fasting glucose test. Whether pre-diabetes expands into full-blown type 2 diabetes is largely up to the individual. Making changes in weight, exercise, and diet can not only prevent pre-diabetes from becoming diabetes, but can also return blood glucose levels to the normal range.

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