Estradiol is a form of the female sex hormone estrogen, and rats with low levels of it retain more water, according to a new study published in the American Journal of Physiology.
Water retention is the primary reason why many women will feel bloated at one point or another. Hormonal changes are believed to influence the body’s water balance, but the present study specifically hones in on sex hormones. These hormones regulate what’s called aquaporin 2 (AQP2), or the water-absorbing channels located along the kidney ducts. Researchers cited that kidneys control “the amount of water reabsorbed from the blood they filter.”
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