Glucose is an essential energy source, especially for the brain and muscles. However, for longevity, it is not glucose itself but how the body handles it that matters. Chronically elevated blood glucose levels—caused by high sugar intake or insulin resistance—promote oxidative stress, inflammation, and glycation, all of which accelerate aging. Evidence from epidemiological and mechanistic studies suggests that moderate carbohydrate intake with a low glycemic index, combined with time-restricted eating, can improve insulin sensitivity and delay age-related diseases. Direct glucose supplementation is not beneficial for healthy individuals and may be harmful. The evidence is strong for the link between hyperglycemia and aging, but weak for any longevity benefit of glucose itself. In summary: glucose is necessary, but excess is detrimental. Managing glucose metabolism through diet and lifestyle is key for healthy aging.
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