Your immune system defends against injury and disease. It attacks pathogens, neutralizes harmful substances and fights disease-causing changes in the body. But less has been known about its role in depression, until experts realized it can get hacked — by stress.

A metabolic by-product you can trick your body into producing more of appears to supercharge immune cells as they fight infection and disease, research is finding. There are a couple of ways to get them going…

People with diabetes are at higher risk of developing serious lung infections following a respiratory infection. Diabetes can weaken the immune system, but its specific effects on the lungs have been unclear, until now. What research has found may signal a way to dial it back…

A tiny organ that’s often ignored is the key to helping keep colds and flu away and your immune system balanced to avoid autoimmune disease. But it’s also connected to immune system aging. Here’s how to keep yours youthful…

Decades of research confirm that exercise promotes head to toe health. But did you ever wonder exactly what it is about exercise that helps prevent disease? Find out what really goes on inside of your cells when you exercise…

If you seem to catch whatever bug is going around, your T cells may be exhausted. This type of exhaustion isn’t something a quick nap can fix, but researchers are exploring exactly why it occurs, revealing big clues about what to do about it.