Pregnancy brain finally has a real biological origin, and dismissing it as a myth should end now. A specific hypothalamus-to-hippocampus circuit gets hijacked by sustained high estrogen, and switching that pathway off restored memory, while women in late pregnancy showed the same estrogen-linked memory dips. That is validation for what mothers have described for generations.
The hard proof here lives in mice, not humans. The circuit was never manipulated or even measured in pregnant women, and the human side rests on 70 participants plus self-reported fogginess rather than objective causal testing. A promising hypothesis deserves careful follow-up, not headlines treating a rodent pathway as settled human biology.
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