Strawberries are usually very well tolerated, but allergic reactions may appear  — especially in young children.

Strawberries contain a protein that can cause symptoms in people who are sensitive to birch pollen or apples — a condition known as pollen-food allergy.

Common symptoms include itching or tingling in the mouth, hives, headaches, and swelling of the lips, face, tongue, or throat, as well as breathing problems in severe cases.

The allergy-causing protein is believed to be linked to strawberries’ anthocyanins – the pigmentation that gives strawberries their bright red colour. Therefore colourless, white strawberries are usually well tolerated by people who would otherwise be allergic.

Furthermore, strawberries contain goitrogens that may interfere with the normal function of the thyroid gland in people with thyroid problems.