These past days, there've been lots on articles about the amount of coffee drank and a decrease in breast size.

The Telegraph has an interesting article where you can read:

The more coffee the women drank, the smaller their breasts, the researchers also found. Almost 300 women took part in the study, which questioned them on how many cups of coffee they drank in an average day and measured the size of their bust.

Which means that heavy coffee drinkers had smaller breast size. There is a gene though that links coffee with breast volume though which apparently leads to the conclussion that the more coffee you drink your breast will become smaller. but as the study says, it affects about 50% of women.

Around half of the women in the study carried a gene mutation which appeared to link coffee intake and breast volume, according to the findings. "Drinking coffee can have a major effect on breast size," said Helena Jernstrom, from Lund University in Sweden, who led the study. ... Women who drank more than three cups of coffee a day had breasts an average of 17 per cent smaller than those whose who drank less than three cups a day.

The conclussion is good though:

However, the study found that a large consumption of coffee could have a positive impact on the health of the breasts. Drinking caffeine regularly appeared to reduce the risk of breast cancer among the volunteers, who had been specifically selected from families at high risk of contacting the disease. The scientists believe that the effects of coffee are linked to its impact on the female sex hormone, oestrogen, and the fact that it can also affect levels of the male sex hormone, testosterone.

So, drinking coffee is good for your breasts, and chances are that they won't really shrink