Scientists believe that too much caffeine can affect the hormones in a body which have impact on women's breasts size. So the more coffee a woman drinks, the smaller her breasts get.
Almost 300 women took part in the study. According to the results, published in the British Journal of Cancer, drinking three or more cups a day was enough to cause a smaller breast size! Furthermore, the effects of the stimulant rose for every cup drunk.
The fact is that around half of the women in the study carried a gene mutation which appeared to link coffee intake and breast volume.
"Drinking coffee can have a major effect on breast size," said Helena Jernstrom, from Lund University in Sweden, who led the study. "Coffee-drinking women do not have to worry their breasts will shrink to nothing overnight. They will get smaller, but the breasts aren't just going to disappear."
She added: "However, anyone who thinks they can tell which women are coffee drinkers just from their bra measurements will be disappointed. The problem is that there are two measures for a bra, the cup size and the girth, so you wouldn't be able to tell."
However, the study found that a large consumption of coffee could have a positive impact on the health of the breasts, particularly it reduces the risk of breast cancer.