The presence of obsessions or compulsions, or both, are what distinguishes obsessive-compulsive disorder from other conditions. The obsessions or compulsions cause marked distress, are time-consuming, and interfere with a person's normal functioning.
(1989) concluded that everyone excretes stinky compounds in their urine after eating asparagus, and the only variation is in ability to smell them. Other papers using chemical tests and carefully controlled smelling tests show that there is variation in excretion of sulfur compounds in urine after eating asparagus.
Scientists have identified one of only a few known genetic contributions to the sense of smell. Most, but not all, people detect a distinct sulfurous odor in their urine shortly after eating asparagus. Sensory testing demonstrated that some do not produce the odor while others do not smell it.