Diabetic ketoacidosis (DKA) is a dangerous buildup of acids called ketones in your blood. Ketones are produced when your body doesn’t have enough insulin to convert sugar into energy.

Learn more about diabetic ketoacidosis. Ketosis may cause bad breath. Ketones are broken down for use as a fuel source, and acetone is one of the byproducts the body excretes in the urine and breath.