A fruity-smelling breath is common among people with diabetes. When your body doesn't have enough insulin to turn sugar into fuel, it will use fat instead. When the fat breaks down, byproducts called ketones build up in the body and produce the fruity smell.
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Breath that smells fruity or sweet could be a symptom of a ketoacidosis, which is a diabetic issue where glucose or sugars cannot be used by the body due to a lack of insulin. This can be a potentially dangerous condition if it is not treated. Other symptoms of ketoacidosis include fatigue, frequent urination, headache, dry skin or mouth, muscle stiffness, nausea, and extreme thirst.
(This answer provided for NATA by the Georgia College & State University Athletic Training Education Program.)