Your immune system
You probably don’t think much about your immune system until you’re willing it to banish a nasty bug. But your immune system does a great job attacking bad-news microbes every single day. That is, as long as you’re supplying the support it needs, says Neil Schachter, MD, a pulmonary disease specialist at the Icahn School of Medicine at Mount Sinai in New York City. There are a host of ways to boost your immunity—from eating apples (they really do keep the doctor away!) to having sex on the reg. Here’s a primer to help you stay healthy till spring and beyond.