You can see this association mapped out here: Not only that, the researchers only measured the women's breasts once—so there was no active shrinking.
May I ask you a personal question? Caffeine, they said, is one of the worst.
Estrogen, which is responsible for breast tissue growth and development, will be inhibited from doing its job by phytoestrogens.
And you know the story: The period has left the scene but the pain is still there with all its glory! However, the research done on caffeine and breast cancer found that drinking coffee does not increase any risk in breast cancer.
Do female coffee-lovers need to worry about their breast size? However, there has been no link between coffee and breast cysts or fibrosis.
In the they surveyed 269 women and found that those that drank 3 or more cups of coffee a day had smaller breasts than those who drank less than 3 cups of coffee.