From the Research
People are usually allergic to proteins in coffee, not the caffeine itself, and this allergy can be triggered by specific proteins found in coffee beans, as supported by general medical knowledge and studies on anaphylaxis and allergies 1, 2. When considering the potential for an allergic reaction to coffee, it's essential to understand that coffee allergies are rare but can be severe, including symptoms like skin reactions, respiratory issues, digestive problems, or anaphylaxis. The key to managing such allergies is proper diagnosis by an allergist and distinguishing between a true coffee allergy and caffeine sensitivity, which has different symptoms like jitteriness, increased heart rate, or anxiety 3, 4. Given the potential severity of anaphylaxis, a condition that can be triggered by food allergies including those to coffee proteins, the importance of prompt and appropriate treatment, such as the administration of epinephrine, cannot be overstated, as highlighted in recent studies on anaphylaxis management 5. In terms of specific ingredients in coffee that people are allergic to, while the provided studies do not directly address this question, general medical knowledge suggests that proteins in coffee are the common allergens. Therefore, individuals suspecting a coffee allergy should consult an allergist for proper testing and, if confirmed, avoid coffee and be aware of potential coffee proteins in other foods and beverages, opting for alternatives like herbal teas or grain-based coffee substitutes instead.