Final answer:
Food allergies occur when the immune system reacts to certain foods as harmful. Some common food allergens include nuts, eggs, grains, and milk. Symptoms can range from itching and swelling to severe reactions requiring medical treatment.
Step-by-step explanation:
Food allergies occur when the immune system reacts to substances in food as though they were harmful "foreign invaders." Some common food allergens include nuts, eggs, grains, and milk. Symptoms of food allergies can include itching, swelling, vomiting, diarrhea, and even trouble breathing. It is important to seek medical treatment in case of severe allergic reactions.