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Psychological and physical health are often conceptualized as the absence of disease; there is less research that addresses positive psychological and physical functioning. For example, optimism has been linked with reduced disease risk and biological dysfunction, but very little research has evaluated associations with markers of healthy biological functioning. Thus, we investigated the association between two indicators of positive health: optimism and serum antioxidants.

Association Between Optimism and Serum Antioxidants in the Midlife in the United States Study