Dermatologists say body odor may be in your DNA. A variation in the ABCC11 gene makes some people more likely to smell after a long day as it affects the amount of odor-causing molecules in sweat. Dermatologists say body odor may be in your DNA. A variation in the ABCC11 gene makes some people more likely to smell after a long day as it affects the amount of odor-causing molecules in sweat.