Why dishing does you good: U-M study

ANN ARBOR, Mich.---Why does dishing with a girlfriend do wonders for a woman's mood? A University of Michigan study has identified a likely reason: feeling emotionally close to a friend increases levels of the hormone progesterone, helping to boost well-being and reduce anxiety and stress. "This study establishes progesterone as a likely part of the neuroendocrine basis of social bonding in humans

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Hormones and social bonding: causal interaction. One causes and is caused by the other.