High levels of ketones in the blood stream and urine can lead to a dangerous condition known as ketoacidosis, according to Healthline. Left untreated, ketoacidosis can cause diabetic coma or death in some cases.
When there is not enough glucose in the blood, the body begins to burn fat for energy, which releases ketones, notes the American Diabetes Association. Skipping meals, not injecting enough insulin or having an overreaction to insulin are common reasons for ketones to build up in the body.
Early symptoms of ketoacidosis include dry mouth, frequent urination, fruity breath and nausea, says the American Diabetes Association. If any of these symptoms occur, seek medical attention immediately.