Oxygen may be the gas that keeps us alive, while carbon dioxide is the gas we exhale. But between the inhale and the exhale, CO₂ may help regulate blood flow through the brain and even provide the pulse needed to wash damaging proteins away.

Cancer is rising in adults under 55, and researchers are looking beneath the surface for answers. A surprising clue points to a hidden change inside some younger bodies that could reshape ideas about cancer and aging.

Exercise does more than help build muscle. It could reverse a key driver of muscle aging by helping older muscle cells restore the cleanup-and-repair systems they need to stay strong, responsive and ready for the life you want to keep living.

Think summer sunshine is enough to rebuild your vitamin D stores? New research suggests that for many people the “sunshine vitamin” may stay low all year long. And that could matter more with every passing birthday.

You don’t need a gym, a trainer or a long workout to make sure your strength is there when you need it most. A simple four minute resistance routine helped older adults make gains in the everyday skills that matter for staying fit and independent.

Protein after 50 isn’t just about preserving muscle. Leucine, a key amino acid found in protein-rich foods, may also help support the mitochondria that power your cells, making it part of a bigger strategy for cellular energy and healthy aging.

Knee pain can make surgery feel like the obvious next step, especially when you’re told something inside your knee is torn. But for many aging knees, the tear may not be the real problem. A 10-year study is raising serious questions about a common meniscus surgery, and what may help instead.

Have you ever wondered why salt can worsen high blood pressure? Or why young people are less sensitive to salt’s effect on blood pressure? It comes down to slowed production of an anti-aging factor known as the Klotho protein…

Your immune system can get tired with age, but what if aging immune cells could act young again? Researchers are studying a compound that may help T cells renew their power source. And your gut may be able to make it from foods you already know.

What if something you’re doing, or not doing, in midlife could shape your brain years from now? Researchers have uncovered a surprising link to a major Alzheimer’s marker. The findings may change how you think about long-term brain health.

Aging doesn’t just weaken the immune system. It may take inflammation to a level that makes respiratory infections significantly more dangerous. How this cycle unfolds in the lungs and what reduces your risk is need-to-know information before you get sick…

Monounsaturated fats (MUFAs), found in olive oil, avocados and nuts, may help strengthen immune cells and improve their ability to survive stress. But balancing MUFAs with polyunsaturated fats (PUFAs) appears key to optimal immune function…