Is ‘germ-free’ living making you more sick?

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Contrary to many modern beliefs, attempting to stay germ-free may actually be detrimental to your health. Some researchers call this “the hygiene hypothesis,” which argues that too-clean environments prevent the immune system from learning to deal with germs naturally, leaving us susceptible to illness. NBC News medical contributor Dr. Natalie Azar talks with the TODAY anchors about the theory, and what it can mean for your daily routine.