Milk derivatives are used in many other food products such as candy bars, chocolate, cakes and even some chips. Research on the link between rBST and breast cancer has produced mixed results, and more study is needed to evaluate the potential association.
IGF-1 has been shown to stimulate growth of human breast cancer cells. A recent review of the relevant epidemiological data revealed no associations between consumption of cow milk and breast cancer. Reviewed [1] European Commission. Brussels: EC, Topics: Glossary of Exposures. Take Action Donate. The FDA, for its part, says that the thyroid and prostate changes were the same in the test and control groups, and that Canadian reviewers simply misinterpreted the study results.
IGF-1 occurs naturally in both cattle and humans, but there have been possible connections drawn between higher levels of IGF-1 in humans and increased risk of some cancers , including studies linking IGF-1 to breast cancer. Additionally, after rBGH was approved in , the FDA ignored appeals from consumers, food safety organizations, and scientists to reverse its approval of the hormone, or to even require labeling of foods containing rBGH.
While the potential ramifications of rBGH use for humans are certainly worth examining, so are the risks for the cows being given them. In cows treated with rBGH, health problems often develop. According to a meta-analysis published in , injecting cows with rBGH increases the risk of three important health conditions:. An increased risk of mastitis is particularly concerning—for cows and the rest of the world—because these infections are treated with antibiotics, and the high use of antibiotics in livestock can create antibiotic-resistant bacteria.
Given that growth hormones are produced naturally by cows, they can be expected to register at some level in all milk samples. Several scientific reviews have looked at these issues and are the main focus of this document. Second, cows treated with rBGH tend to develop more udder infections mastitis.
These cows are given more antibiotics than cows not given rBGH. Does this increased use of antibiotics lead to more antibiotic-resistant bacteria, and is this a health concern for people?
This remains a concern, but it has not been fully examined in humans. Bovine growth hormone levels are not significantly higher in milk from rBGH-treated cows. On top of this, BGH is not active in humans, so even if it were absorbed from drinking milk, it wouldn't be expected to cause health effects. Of greater concern is the fact that milk from rBGH-treated cows has higher levels of IGF-1, a hormone that normally helps some types of cells to grow.
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