In "Sighs and Sneezes" (Feb. 8), Bettyann Kevles writes that "a diet of antihistamines suppresses the body's defenses and can weaken its ability to fight other foreign substances such as disease-causing viruses." There is no proof that this statement is true. All that antihistamines do is block receptor sites where a histamine is to act in the body. They have no suppressing factor on the body's immune system itself.
Sydney T. Levenson MD
Asthma & Allergy Foundation