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What are the main physiological roles of cortisol?

Cortisol helps the body respond to stress and maintain homeostasis. It raises blood glucose by promoting gluconeogenesis (the formation of glucose in cells) and the breakdown of proteins and fats, supports cardiovascular function by helping to maintain blood pressure, and enhances the effects of other stress hormones. It also suppresses inflammation and immune responses, follows a circadian rhythm that influences energy and alertness, and affects bone, connective tissue, mood, and development (especially fetal lung maturation).