Tagged With menstruation

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Fitbit has just launched what they say is one of their most requested features: Period tracking. The app and smartwatch can now show you where in your cycle you are, the better to correlate cycle data with your nutrition and sleep.

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The theory that close friends have their periods at the same time is over 40 years old now, but there has never been much evidence to support it. The people behind the period tracker Clue checked their own data recently and came up with another nail in the coffin: Zero evidence that closeness makes people bleed in sync.