Can I drink coffee if I have food allergies?

There is no unified answer to whether you can drink coffee if you have a food allergy. It mainly depends on your specific allergens and the ingredients of the coffee you drink - as long as you are not allergic to the coffee beans themselves or common additives in coffee, you can drink it normally. Most of the cases where you are confused are accidentally touching hidden allergenic excipients, or rare cross-allergic reactions.

I met a friend who is allergic to cashew nuts a while ago. He usually drinks pure black coffee with no problems. Last week, he picked up a limited-edition flavored latte brought by a colleague at work. After two sips, the area around his mouth became red and itchy. It took him an afternoon to recover. Later, when I checked the ingredient list of that coffee, I found that the hazelnut sauce was mixed with a trace amount of cashew nuts. He didn't pay attention at all at the time.

There is still a small controversy in the academic community that is not yet fully concluded: less than 1% of people allergic to birch pollen will experience slight numbness and itching in the mouth when drinking dark roasted coffee. It is speculated that a protein produced by coffee beans during the dark roasting process is too similar to the allergenic protein structure of birch pollen, which just triggers an immune response. However, the probability is too low. Most hay fever patients are not affected at all by drinking coffee, and there is no need to avoid coffee.

Many people actually can’t tell the difference between caffeine intolerance and coffee allergy. If you only experience palpitations, insomnia, and a little acid reflux in your stomach after drinking coffee, it’s mostly caffeine intolerance, which is completely different from an immune-mediated food allergy. Don’t label yourself as a coffee allergy. If you are really worried about whether you will be allergic, take a sip of pure black coffee without milk, syrup, or any flavoring for the first time. If there is no rash, itching, or respiratory discomfort for two or three hours, it means that there is no problem with the coffee beans themselves. When you drink coffee with added ingredients, scan the ingredient list more often and avoid ingredients that you are clearly allergic to. There is no need to blacklist the entire coffee.

Oh, by the way, there is another pitfall that is easy to get into: the non-dairy creamer added to many instant coffees contains casein. Many people who are allergic to milk protein feel uncomfortable after drinking instant coffee. They think they are allergic to coffee beans, but in fact it is all non-dairy creamer. Try using pure black coffee next time and maybe it will be fine.