I do a monthly self-check, but Alan has his hands on my breasts enough that he's sure to know if something feels different, and he knows what to pay attention to and to tell me if he notices anything. So I guess you could say I've got an all month long monitoring system (lol).
Estrogen has been touted as the main culprit in breast cancer formation so I watch what I eat when it comes to meats and dairy since our illustrious government still thinks it's ok to allow hormones in food-destined livestock. We only buy things that are labeled as being organically raised with no hormones or other nasties in them. Actually we eat a lot of organically grown everything. I also avoid soy since some research says that it mimics estrogen in the body, but the jury is still shaky on that one. There are a few researchers who say that soy only mimics estrogen only to the extent that it doesn't make the body create more, so it may turn out that avoiding soy isn't a good thing after all.
Last but not least Alan avoids getting too rough with my breasts when we're playing. There have been several reports of women developing breast cancer after having direct trauma to one (and that's why some doctors are saying smashed boob mammograms can be dangerous too) so mine only get love