How are Selen and Langlebigkeit related?

The relationship between selenium and longevity is nuanced and evidence-dependent. Selenium is an essential trace element that functions through selenoproteins (e.g., glutathione peroxidases) to provide antioxidant defense, support thyroid metabolism, and modulate immune responses. An adequate selenium status is associated with reduced all-cause mortality and lower risks of certain cancers, cardiovascular disease, and cognitive decline, particularly in populations with low selenium intake. However, large randomized controlled trials (e.g., SELECT, NPC) have not demonstrated clear benefits of selenium supplementation in well-nourished individuals, and high doses can be toxic (selenosis) and may increase diabetes risk. The evidence is primarily from observational studies and mechanistic data; interventional evidence is mixed. For longevity, maintaining an optimal selenium level through diet (e.g., Brazil nuts, fish, eggs) rather than supplementation appears most prudent. Consumer DNA tests for selenium-related genes (e.g., SEPP1 variants) currently lack validated clinical utility for lifespan prediction.