Dr. Laura: Dairy and hormone based cancers

There are mixed reviews on dairy consumption in hormone based cancers.  
Fortunate for Canadians, their milk supply is protected from added hormones, where the US supply is not. If you go for organic, is it better? Organic dairy is GMO-free which should technically then be free of hormone mimickers like organophosphate and glyphosate. Is this all we have to worry about?

Insulin growth factor


There’s more to the story of dairy and hormones. Insulin growth factor (IGF-1) is in all dairy products, naturally. Even natural organic milk will have it. IGF-1 both protects aging bones and has the potential to aggravate hormone based cancers. It seems that IGF-1 prevents cells from dying when they should and thus has the potential to promote the spread of existing breast cancer cells. From this we might conclude that less IGF-1 (less dairy) in the diet may reduce the spread of an existing hormone based cancer. Research continues.

“A 3 serving increase in milk consumption per day is associated with an 18.6% (95% CI= 0.9% to 39.3%) increase in free IGF-I levels.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3978780/



For breast cancer survivors research says to reduce dairy. At 1/2 c a day of yogurt, this may be enough to have reduced, but this is a decision you will have to make for yourself, given the facts we know and the ones we may not yet know.

What about the bones?

After estrogen deprivation therapies, the bones are often weakened. For protection, protein (about 1g per kg of body weight per day), weight bearing exercise as well as your mineral matrix is important.

Calcium supplementation should not exceed 500mg. Daily recommended intake of calcium is about 1200-1500mg per day. Many dairy alternatives like almond or cashew milk are supplemented with calcium. Food sources include canned salmon with the bones in it, sesame seeds, broccoli, dark leafy greens, chia seeds and molasses. Although spinach is high in calcium it not easily available as it is also high in oxalates that bind it.

Decisions about health are personal. We make the best decisions we can with the information we know at the time.

Here are some other related links you might like to check out:

Canada protects its milk supply from added hormones: https://albertamilk.com/ask-dairy-farmer/ive-started-buying-organic-milk-based-on-the-assum/

For GMO free: http://organicmeadow.com/ENGLISH-FAQ.htm

“IGF-I is an essential factor for longitudinal bone growth. IGF-I can also exert anabolic effects on bone mass during adulthood.” https://academic.oup.com/ajcn/article/99/5/1256S/4577510 

Effective inhibition of IGF signal transduction should be included in combinations of targeted drugs designed to treat metastatic oestrogen receptor-positive breast cancers.” https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4722749/

About the author:Dr. Laura M. Brown ND is a Naturopathic Doctor with a Functional Medicine approach. She is a Certified Gluten Practitioner, A HeartMath Certified Practitioner and is a graduate of Adapt Level 1 at Kresser Institute of Functional Medicine. Essentially, Dr. Brown helps people better digest their food and the word around them. More at www.naturalaura.caand  www.forwardhealth.ca