A recent review explains alpha-gal syndrome (AGS), a food allergy that can develop after a tick bite. The syndrome is an IgE-mediated sensitivity to a sugar molecule called alpha-gal, which is found in red meat and some other products. For people with AGS, eating meat can trigger allergic reactions, but the symptoms are not immediate. Instead, reactions typically occur 2 to 8 hours after exposure, which can make it hard to connect the symptoms to the food.
The review, written for dietitians, notes that AGS is a growing concern in the United States, with an estimated 15,000 new cases each year. However, the true number may be higher because many cases are suspected but not confirmed due to testing limitations and limited awareness among both patients and doctors.
Reactions can range from hives (urticaria) to a severe, life-threatening allergic reaction called anaphylaxis. This is why it is important for people who suspect they have AGS to see an allergist for proper diagnosis and guidance.
The review is a mini-review, meaning it summarizes existing knowledge rather than presenting new research. It does not provide a global estimate of AGS prevalence, and the authors note that more research is needed. For now, the key takeaway is that if you have unexplained allergic reactions hours after eating meat, especially if you've had a tick bite, talk to your doctor.
