Sometimes, urine can smell. Sometimes it smells like a specific food. Asparagus, for one, causes a characteristic odor due to asparagines, an amino acid. Foul-smelling urine can be indicative of bacteria and potentially a urinary tract infection. In this case, consult a doctor for urinalysis or urine culture tests. Additionally, sweet-smelling urine could indicate diabetes, in which case, also see your doctor.