In some adult who drinks alcohol Derbyshire (2013) argues that in 2004, a Japanese study has been selected 13 volunteers to drink a single bottle of beer and found that those who drank were more attracted to mosquitoes. The researchers believed drinking beer increases temperature in the body and the amount of alcohol in that person is sweat. In 2000, a French has been selected 15 volunteers to drink a single bottle of beer and found that beer drinkers were slightly and more likely to get bitten. Researchers haven't shown whether the effect is the same with wine or alcohol solution, or whether ingredients in beer except alcohol changes the smell of human's skin so that drinking alcohol may make them more attractive to mosquitoes as reported by anonymous (2015).
The amount of carbon dioxide we exhale also determines how drawn these insects are to us. People who produce more carbon dioxide when they exhale tend to be larger, which explains why children get bitten less often than adults ( Borreli 2015 ).