Immune System

Cold plunge is often claimed to boost the immune system. Here’s what the science actually says. The Research The Dutch Cold Shower Study The most famous study on cold exposure and immunity was conducted in the Netherlands in 2016: 3,018 participants took cold showers for 30, 60, or 90 seconds Duration: 30 days Result: Participants who took cold showers called in sick 29% less often Surprising finding: Duration didn’t matter — 30 seconds was as effective as 90 seconds Other Evidence 2014 (PLOS ONE): Regular winter swimmers showed increased white blood cell counts and improved antioxidant defenses 2016 (Journal of Sports Sciences): Cold water immersion increased circulating immune cells Multiple studies: Cold exposure increases norepinephrine, which modulates immune function How Cold Plunge Affects Immunity 1. Increases White Blood Cells Cold exposure triggers a temporary increase in: ...

NAD+ plays a crucial role in immune function. Here’s how it affects your body’s defenses. NAD+’s Role in Immunity 1. Immune Cell Function NAD+ is essential for: T cell activation and proliferation Natural killer cell activity Macrophage function Inflammatory response regulation 2. Inflammation Regulation NAD+-dependent enzymes (sirtuins) regulate inflammation: SIRT1 reduces inflammatory cytokines SIRT3 protects immune cells from oxidative stress Proper NAD+ levels prevent chronic inflammation 3. Cellular Repair Immune cells need NAD+ for: ...