Why Do People Have Allergies? Because Your Ancestors Sexed With Neanderthals

Those of us with allergic peanuts know how difficult it is to avoid around products containing peanuts.

Chocolate bars, cereal, fried foods, and even kissing someone who ate something containing peanuts could cause an allergic reaction.

But why do people have allergies?

We know that there is a reason for these types of allergies. We know why your throat closes and why it is difficult to breathe when you eat or inhale something against which you are allergic, and why you swell if some insects sting or bite you.

And it all started tens of thousands of years ago, when our ancestors came into contact with Neanderthals.

LINKED: I took AncestryDNA and found out that I have 36 siblings

There is a very probable reason why people develop allergies at all. And it’s about our ancestors having sex with Neanderthals more than 40,000 years ago.

A 2014 study by the genetics company 23andMe believed that all non-African individuals carry between one to six percent Neanderthal DNA, and three genes especially in this DNA may be responsible for overly sensitive immune systems that make us susceptible to allergies.

But a 2016 study done by the American Journal of Human Genetics found it more likely that 2 percent of most people’s DNA came from sexual intercourse between humans and Neanderthals.

The 2014 study found that carriers of these three genes more often had hay fever, asthma, as well as other allergies.