Okay, the headline was a bit deceptive since milk consumption probably won’t reduce your risk of breast cancer, but that’s exactly the sort of conclusion I’d draw from a new study if I were as careless about treating dietary studies as many animal rights activists are.
Researchers in Norway studied 48,844 women in an attempt to measure the relationship between childhood and adult milk consumption and breast cancer incidence. Researchers obtained information about the women’s milk consumption in 1991-92, and then followed up 6 years later by obtaining information about breast cancer incidence among the study group.
Childhood milk consumption was slightly negatively associated with breast cancer among women 34-39 but not for women 40-49. Adult milk consumption had a large negative relationship, with women who drank 3 glasses of milk per day have a roughly 40 percent lower risk of breast cancer than women who did not drink milk (this result persisted even after controlling for age, reproductive and hormonal factors, body mass index, education, physical activity and alcohol consumption).
Should young adult women start consuming milk to prevent breast cancer? Probably not, for much the same reason that women shouldn’t abandon drinking milk if the study had found a 40 percent increased risk. These are interesting findings, but even with such a large study, this is still an awfully small association to warrant altering one’s lifestyle over.
Not to mention that, like most dietary studies, the Norway researchers relied completely on self-reporting of milk. Its questionable whether or not people can accurately report how much milk they consumed (in fact, studies of self-reporting find people often make gross errors in reporting contemporary behavior, much less behavior that occurred years and decades ago).
But there is still one conclusion that is probably warranted from the various studies of milk consumption and cancer. None of these studies shows the sort of increased risk of cancer from milk drinking that would be required to establish a causal connection between the two. Whatever else one can say about milk, there seems to be a death of evidence linking milk drinking to cancer, despite what animal rights activists would like you to belive.
Source:
Childhood and adult milk consumption and risk of premenopausal breast cancer in a cohort of 48,844 women – the Norwegian women and cancer study. International Journal of Cancer, Volume 93, Issue 6, 2001.