Only reason for peculiar odour in diabetes is change in odor of breath.
Diabetes and bad breath are related closely. When a person is suffering from diabetes, there is a different type of breath odor from him. It is something different odor from halitosis. The odor in case of diabetes is somewhat unusual which smells like a fruity or sweet odor. The odor resembles the odor in case of ketoacidosis which is rather serious condition and immediate medical attention.