The article highlights new evidence suggesting the thymus plays a much more important role in long-term health and aging than previously believed. Traditionally considered less relevant in adulthood because it shrinks with age, the thymus is responsible for producing T cells, which are essential for immune defense. Two recent studies show that better thymus health is strongly associated with improved outcomes, including longer lifespan and lower risk of cardiovascular disease and lung cancer. One study analyzed 27,000 computed tomography scans using artificial intelligence and found significant variation in thymus activity between individuals, with healthier thymuses linked to better overall health, independent of age, sex, or smoking. A related study found that cancer patients with healthier thymuses responded better to immunotherapy. Although the findings are correlational and not causal, they reinforce the idea that immune system function especially T-cell activity is a key factor in healthy aging and longevity.
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