Ketoacidosis can be a serious complication of type 1 and type 2 diabetes.

Because the body makes little or no insulin in people with diabetes, glucose (a type of sugar) can’t be taken up into the body’s cells and used as an energy source. This means that the body has to use stored fat to provide cells with energy instead. Ketones are natural by-products of fat breakdown, but they can build up in the body and blood, make the breath smell fruity, and cause acid to build up in the blood. This is ketoacidosis.

In very severe cases, ketoacidosis may cause coma and death if it is not treated.