answer:Yes, it depends on your blood type. Just as humans prefer some food over the other, for example one may like Edam cheese more than Cheddar, insects also have preferances. A mosquito for example, can tell what blood type a person is from a 100 feet away. “How do they find us? Scent, Sight and Heat Mosquitoes locate bloodhosts by scent, sight and heat. From 100 feet away (30 meters) mosquitoes can smell your scent, especially the carbon dioxide (CO2) you exhale. Biting_ flies are even better; they can smell their prey from 300 feet (100 meters) away. Because CO2 is present in the atmosphere (plants take in CO2 and give off oxygen), mosquitoes respond to higher-than-normal concentrations, especially when the CO2 is mixed with host-odor. They follow your scent upwind, and can see you at a distance of about 30 feet (10 meters).” Extract from here. ”•Chemical sensors – mosquitoes can sense carbon dioxide and lactic acid up to 100 feet (36 meters) away. Mammals and birds gives off these gases as part of their normal breathing. Certain chemicals in sweat also seem to attract mosquitoes (people who don’t sweat much don’t get nearly as many mosquito bites). •Visual sensors – if you are wearing clothing that contrasts with the background, and especially if you move while wearing that clothing, mosquitoes can see you and zero in on you. It’s a good bet that anything moving is “alive”, and therefore full of blood, so this is a good strategy. •Heat sensors – Mosquitoes can detect heat, so they can find warm-blooded mammals and birds very easily once they get close enough.” Extract from here