Immune Function

A strong immune system is framed as foundational to longevity. A highlighted cancer-model paper reportedly found that urolithin A activated mitophagy in stem cell memory T cells and improved their number and potency. The article distinguishes urolithin A's proposed immune support from rapamycin-like immune suppression. Chronic psychological stress is presented as increasing susceptibility to upper respiratory infections after cold-virus exposure. The article claims its zinc dosage is supported by observed immune performance. A major psychological shock is clinically reported to immediately precede autoimmune disease onset in roughly 98–99% of cases. The article links zinc status to peak immune function. Cortisol impairs healing by inhibiting fibroblasts that manufacture collagen and rebuild damaged tissue. Chronic cortisol exposure suppresses adaptive immunity despite cortisol's short-term anti-inflammatory effects. Immune exhaustion is described as loss of energetic and functional capacity in immune cells, especially T cells. Cell-mediated immunity is controlled by the parasympathetic nervous system. Natural killer cells patrol for early abnormal cells and viral threats. Cortisol…