For some folks, smelling bacon is akin to sniffing a public restroom. According to a study published in PLoS ONE, genetics can make the smell of pork resemble that of urine, onions or faeces.
For the study, researchers asked 23 people (13 consumers and 10 professional sensory assessors) to smell samples from three bottles, one of which contained androstenone. This compound is similar to testosterone found in other male animals, but is male pigs have particularly high amounts of it.
Participants were then asked to pick the strongest smelling bottle. They found that those born with two copies of OR7D4 gene were more sensitive to the bad smell from the pork. Guess these folks will never get to experience the joy of waking up to the smell of sizzling bacon.