Do mosquitoes always bite you but leave everyone else alone? Scientists say these hidden body signals could be the reason why your are targeted

Mosquito bite reasons explained: Have you ever noticed that one person in a group ends up covered in mosquito bites while everyone else walks away untouched? It might seem like bad luck, but scientists say there are real biological reasons behind it.

Research suggests mosquitoes don't choose their targets randomly. Long before they land, they detect signals from the human body, including the carbon dioxide we breathe out, our body heat and even our unique skin scent, as per a report. Together, these clues help mosquitoes decide who is most likely to end up on their menu.

According to experts, these differences are often consistent over time, meaning some people naturally attract mosquitoes more than others.

Carbon dioxide helps mosquitoes find you from a distance

Female mosquitoes, which are the ones that bite humans, rely on blood to obtain the protein needed for egg development, as per a BBC report.

According to the report, mosquitoes can detect people from around 10 meters away by using sight and smell. One of the strongest signals they follow is carbon dioxide (CO2), which humans release every time they breathe.

Adults generally produce more carbon dioxide than children, making them more attractive to mosquitoes. The insects are also drawn to other sources of carbon dioxide, which is why dry ice and bottled CO2 are often used in mosquito traps, as per the BBC report.

Body heat can make you even more attractive

Carbon dioxide isn't the only clue mosquitoes use. As per the report, they are also attracted to body heat and moisture. The combination becomes even stronger when carbon dioxide is present.

Pregnant women are estimated to be twice as attractive to mosquitoes because pregnancy increases both body temperature and breathing volume, resulting in more heat and carbon dioxide being released.

People who have recently exercised may also attract more mosquitoes because physical activity temporarily raises body temperature, increases sweat and boosts carbon dioxide production. Larger-bodied people may also attract more mosquitoes because they generally produce more heat and exhale more carbon dioxide, as per the BBC report.

Your skin scent may be the biggest factor

Once mosquitoes get closer, they begin relying heavily on smell. Researchers say every person produces a unique skin scent made up of hundreds of volatile organic compounds (VOCs). These compounds are created when bacteria living on the skin break down natural substances such as carbohydrates, fatty acids and peptides.

Scientists have identified more than 500 VOCs on human skin, and mosquitoes can detect the differences between them, as per the BBC report.

Research has shown mosquitoes are attracted to substances such as ammonia and lactic acid, while carboxylic acids can make certain people even more appealing.

One study found huge differences between people

Researchers at Rockefeller University studied the skin scent of 64 people by having them wear nylon sleeves for six hours.

The sleeves collected each person's natural skin odor, allowing mosquitoes to choose between different scent samples.

The results showed a clear preference for individuals with higher levels of carboxylic acids. Researchers calculated attractiveness scores and found the most attractive participant scored 100 times higher than the least attractive, as per the BBC report.

Your skin bacteria may influence mosquito attraction

The bacteria naturally living on your skin also appear to play a role.

Researchers from Wageningen University found that people who attracted more malaria mosquitoes had skin bacteria that were more abundant but less diverse than those who attracted fewer mosquitoes.

Because skin bacteria help produce body odor, they may influence how appealing someone smells to mosquitoes.

Genetics may also play a role

Studies involving twins suggest mosquito attraction may be partly inherited.

Identical twins tended to attract mosquitoes at similar levels, while non-identical twins often differed, suggesting that some of the traits influencing body odor are genetic.

Researchers have also found that genetics can influence how people react after being bitten. Some individuals develop larger, itchier welts, while others have only mild reactions.

Experts say this may explain why some people believe they are bitten more often when they may simply react more strongly.

What experts recommend to reduce mosquito bites

Experts say there is little or unclear evidence that eating garlic or taking vitamin B supplements helps keep mosquitoes away, as per the BBC report.

Instead, they recommend using proven insect repellents containing DEET, picaridin or PMD.

Wearing insecticide-treated long sleeves and trousers can also reduce bites, especially because mosquitoes often target exposed skin. Since protection fades with sweat and time, repellents should be reapplied as directed.

FAQs

Why do mosquitoes bite some people more than others?
They are attracted by signals such as carbon dioxide, body heat and skin odor.

Why are adults bitten more than children?
Adults generally produce more carbon dioxide.