Buzz
Have you ever been on a group hike without bug spray or hosted a backyard cookout only to be invaded by mosquitoes? By the end of the day, some folks are riddled with bites, while others barely have a scratch. 'Mosquitoes are drawn to me,' the unlucky ones might say—and they’re likely correct.
For years, it’s been clear that mosquitoes show a preference for certain individuals, but pinpointing the exact reasons has proven challenging. Spoiler: While researchers haven’t fully solved the puzzle, they’ve uncovered several intriguing clues.
Physical size and level of activity
To begin with, mosquitoes are drawn to humans by detecting the carbon dioxide we exhale. Larger individuals, who consume more oxygen and emit more carbon dioxide, are more likely to attract mosquitoes. This explains why adults are targeted more than children, bigger adults more than smaller ones, and pregnant individuals more than those who are not.
Physical activity also plays a role. When we exercise, our breathing increases to meet the oxygen demand, resulting in higher carbon dioxide output. This makes exercisers more appealing to mosquitoes. Additionally, mosquitoes are attracted to body heat, which rises during physical activity.
Dark-colored attire
After mosquitoes pinpoint a general area, they gravitate toward large, dark objects. Individuals wearing dark clothing tend to receive more bites compared to those in light-colored outfits. When mosquitoes are active, opting for lighter shades is advisable. Some studies indicate that red or orange clothing may particularly attract Aedes mosquitoes (commonly found in the southern U.S.), so choosing blues or greens might be a safer option.
Your natural scent
Other factors also play a role in determining mosquito preferences, though researchers are still uncovering the specifics. For instance, consuming alcohol appears to increase our attractiveness to these insects.
Additionally, a recent study involved participants wearing stockings on their arms for several days to collect their scent. These stockings were then exposed to mosquitoes, which showed a clear preference for some over others. The goal was to genetically modify the mosquitoes' sense of smell to see if it would prevent them from detecting certain individuals. However, this part of the experiment was unsuccessful.
Interestingly, the differences in attractiveness were stark. One sample, from Subject 33, was 100 times more appealing to mosquitoes than the least attractive sample. As the researchers explained to Sci Tech Daily:
The samples were anonymized, so the experimenters didn’t know which participant wore which stocking. Yet, trials involving Subject 33 stood out immediately, as mosquitoes swarmed toward that sample. 'It would be obvious within seconds,' noted researcher Maria Elena De Obaldia.
Chemical analysis revealed that the more attractive stockings contained higher levels of carboxylic acids, which are produced by our sebaceous glands. The bacteria and microbes on our skin likely influence this chemical profile as well. While the exact reasons remain unclear, it’s evident that some individuals naturally emit scents that mosquitoes find irresistible.
