Join the new generation of the Nurses’ Health Studies. Much of what we know about health and wellness is thanks to the Nurses’ Health Studies. The dangers of tobacco and the benefits of nutrition are everyday news. Most of us can’t remember a time when we didn’t know about the importance of being physically active. This wasn’t always the case. The Nurses’ Health Studies have changed what we know about health. But there’s still much more to learn. That’s the reason for Nurses’ Health Study 3.