Well, the basic reason is protein, but it is not because protein is too high, but because allergic people themselves have low acceptance of protein. Because the higher the content of protein in food, the easier it is to induce allergic diseases.

People with allergies like you must avoid some high-protein foods, but doctors don't know which foods you may be allergic to, so they won't let you eat these things that may aggravate your condition.

For the human body, protein contained in eggs belongs to foreign protein. That is to say, it is not the protein of the human body itself. A foreign protein like this is an antigen for human beings, and like bacteria and viruses, it will be recognized by the immune system as an in vitro antigen, which will immediately trigger a series of immune reactions.

Some people with sensitive constitution are particularly sensitive to this heterogeneous protein, and the immune system often overreacts and produces histamine, which leads to allergic reactions, also known as allergies.

In addition, often the second encounter with the same allergen will produce a greater response, because the body has produced specific antibodies, so the immune response is stronger. Light can cause urticaria, and severe can even lead to shock and death.

Allergy to something is caused by personal heredity, which is difficult to solve. But the symptoms of allergies are different for everyone. Let's talk about myself. My friends and I are allergic to the skin of sweaters. My friend had a rash when drinking milk during the allergic period, but my face was red and hot when I ate sea fish. If you are brave, you can try to eat slowly. Most people are not allergic to so many things at the same time ~

I also talk about the principle of food allergy here:

Generally speaking, food allergy patients will produce a reagin called LgE after eating a certain food, and excessive LgE can bind to a mast cell containing a variety of allergic transmitters. When eating this food again, the food protein will react with LgE attached to mast cells, stimulating mast cells to release histamine and other substances, causing blood vessels to dilate, smooth muscle to contract, secretion and overflow to increase, thus causing allergic symptoms.

Therefore, in theory, any food containing protein may cause allergies.

For example, some people are allergic to seafood because things such as shrimp and crabs also contain high protein. Similarly, aquatic products, fish with low protein content are less allergic than shellfish (of course, for safety reasons, it is better not to eat them).