The connection between your gut and aging isn't just about digestion anymore. Groundbreaking research is revealing that the trillions of bacteria living in your intestinal tract may be the master regulators of how well—and how long—you age. As a longevity medicine physician, I've watched this field explode with clinical insights that are changing how we approach healthy aging. The latest studies aren't just telling us that gut health matters; they're showing us exactly how our microbiome...

When I think about what separates patients who age well from those who don't, the answer almost never comes down to a single intervention, a single lab value, or a single medication. It comes down to function at the cellular level — and increasingly, the evidence points to mitochondrial health as the organizing principle behind most of what we call aging. Mitochondria are not just energy factories, though that function alone is sufficient to make them central to everything. They are also...

Testosterone and Your Heart: What the Largest Clinical Trial Ever Tells Us For years, men and their doctors have been caught in a frustrating bind: low testosterone causes real symptoms — fatigue, low libido, depression, cognitive fog, loss of muscle — but the fear of heart attack or stroke has kept many from seeking treatment. That fear is now largely resolved. Here's what the science actually says. The Question That Needed an Answer The controversy started with conflicting observational...