Can you have allergic reaction to a food you have always eaten before?

Yes, it's possible to have an allergic reaction to a food you've eaten before without any issues. This can occur due to changes in your immune system or if the food has undergone changes in its composition or processing. Additionally, repeated exposure to certain allergens can sometimes lead to sensitization, resulting in an allergic response even after years of tolerance. If you suspect a food allergy, it's important to consult a healthcare professional for proper evaluation and guidance.