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A study examining cholesterol levels and life expectancy across populations has drawn attention to the complex relationship between cholesterol and longevity. Some observational studies have found that older adults with higher total cholesterol levels had lower overall mortality during follow-up, particularly among the oldest age groups. Researchers suggest that cholesterol levels can be influenced by age, nutritional status, inflammation, and underlying health conditions, which can affect how cholesterol relates to survival. A large global analysis covering 200 countries also documented substantial differences in cholesterol levels across regions, highlighting the importance of studying cholesterol alongside other population health factors.Cholesterol plays an essential role in building cell membranes, producing hormones, and supporting normal body functions. However, different types of cholesterol have different implications for health. High LDL cholesterol is associated with a greater risk of atherosclerotic cardiovascular disease, while HDL cholesterol participates in transporting cholesterol through the bloodstream. Global disease-burden research estimates that elevated LDL cholesterol contributes substantially to cardiovascular illness and premature death worldwide.See links to studies in the comments