It sounds like the plot of a horror movie: an innocent hiker is bitten by a bug, and suddenly they become violently ill every time they eat meat. Their skin erupts in hives, their throat swells, and they’re short of breath. It’s the stuff of nightmares.
As unsettling as it is, this scenario is all too real and is affecting a growing number of people each year. It’s called alpha-gal syndrome (AGS), a tick-borne condition that causes an allergy to alpha-gal… a sugar found in the tissues of most mammalian species. Only primates – which aren’t typically a source of human food – lack alpha-gal. AGS is spread through tick saliva (particularly after the bite of a lone star tick) and results in an allergy to meat, dairy, and other products derived from mammals.