Debunking the Myth of Menstrual Synchrony Among Women
Your Friends Swear Their Periods Sync Up. I Asked Experts for the Truth.
Vice News
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The belief that women's menstrual cycles sync up is largely a myth, according to experts. Studies show that cycles tend to drift apart rather than align, with coincidences attributed to chance rather than biological mechanisms.
- 01The idea of menstrual synchrony originated from a small study in the 1970s, which has not been replicated.
- 02Research from the University of Oxford indicates that women's cycles drift further apart over time.
- 03Experts attribute perceived synchrony to coincidence and confirmation bias rather than biological processes.
- 04There is no proven mechanism, such as pheromones, that would cause menstrual cycles to sync up.
- 05The phenomenon is often misinterpreted due to the natural variations in cycle lengths and the tendency to remember coincidences.
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The notion that women's menstrual cycles sync up is a common belief, but experts assert that it lacks scientific backing. Dr. Jody-Ann McLean, a women's health expert, explains that the idea originated from a small 1970s study that has not been successfully replicated. A more recent analysis from the University of Oxford found that, rather than syncing, women's cycles tend to drift apart over time. Kat Grassetti, a clinical director at Monima Wellness Center, notes that while friends or roommates may experience coinciding cycles, this is primarily due to chance rather than any biological synchronization. The misconception may stem from confirmation bias, where people remember instances of alignment while overlooking the many times their cycles do not match. Overall, there is no evidence or mechanism to support the idea of menstrual synchrony, making it a fascinating yet unfounded concept.
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