Fruity-smelling breath is a sign of high levels of ketones in someone who already has diabetes.
It’s also one of the first symptoms that doctors look for when they check for DKA.
High blood sugar (hyperglycaemia) affects people who have diabetes, said the Mayo Clinic.
The health site added: “Several factors can contribute to hyperglycaemia in people with diabetes, including food and physical activity choices, illness, nondiabetes medications, or skipping or not taking enough glucose-lowering medication.
“If hyperglycaemia goes untreated, it can cause toxic acids (ketones) to build up in your blood and urine (ketoacidosis).
“Signs and symptoms include a fruity-smelling breath.”