In general, walnuts are very healthy. However, some people may be allergic to them.
Walnuts can also reduce mineral absorption in certain individuals.
Walnut Allergy Walnuts are among the eight most allergenic foods
Additionally, the symptoms of a walnut allergy are typically severe. Walnuts sometimes cause an allergic shock (anaphylaxis), which can be fatal without treatment.
Individuals with a walnut allergy need to avoid these nuts completely.