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Many studies have been carried out on the effects of the substances in coffee on the human body, often with contradictory results. For many people, coffee is a necessary weapon to help them fight their way through the day, but we don’t necessarily understand how it effects us apart from waking us up.
These raised levels of estrogen may cause pain in the breasts.
The University of Lund, in Sweden, carried out a study that showed how caffeine changes estrogen levels in women, which can cause a reduction in breast size.