I applaud the Duchess of Cornwall for highlighting the issue of osteoporosis, which can be a debilitating condition.
However, to cite dairy-free diets as harmful to bone health is just ignorant and not based on scientific data. A healthy diet and lifestyle is fundamental to preventing osteoporosis. Important nutrients for bone health include calcium, potassium, magnesium, vitamin K and vitamin D, which can all be obtained on a health plant-based/vegan diet.
The dairy industry has very successfully propagated the myth that dairy consumption is essential for optimal calcium intake, yet lactose intolerance (the inability to break down the sugar in milk) is common, affecting 50-95 percent of people in many non-Caucasian populations (Bayless, Brown, & Paige, 2017).
Consumption of dairy has not been shown to improve bone health or prevent osteoporosis and bone fractures (Bischoff-Ferrari et al., 2011; Bolland et al., 2015). In fact some studies find that milk consumption is associated with a higher fracture rate (Michaëlsson et al., 2014). Consumption of milk in adolescence does not appear to prevent fractures in later life (Feskanich, Bischoff-Ferrari, Frazier, & Willett, 2014).
The consumption of dairy has actually been more consistently linked with detrimental effects on health. Dairy, including milk and cheese, is one of the top sources of saturated fat in the typical Western diet. Diets high in saturated fat increase the risk of heart disease, stroke and dementia (Ludwig, Willett, Volek, & Neuhouser, 2018).
The consumption of dairy products has been associated with an increased risk of prostate cancer in men (Aune et al., 2015) and an increased risk of lung, breast and ovarian cancer (Ji, Sundquist, & Sundquist, 2015). There are a number of reasons why dairy may promote cancer, including the main milk protein, casein, which in the laboratory has been shown to promote cancer growth (Youngman & Campbell, 1991).
Dairy consumption elevates oestrogen levels in the blood, which promotes female cancers (Michels, Binder, Courant, Franke, & Osterhues, 2019). Dairy, along with other sources of animal protein, elevates blood levels of the hormone IGF-1, which is a risk factor for cancer (Ma et al., 2001; Qin, He, & Xu, 2009). Vegans have a lower levels of IGF-1 when compared to omnivores (Allen, Appleby, Davey, & Key, 2002) and an overall lower rate of cancer (Dinu, Abbate, Gensini, Casini, & Sofi, 2017). Milk consumption has also been implicated in the development of acne in adolescence (Juhl et al., 2018).
The optimal daily intake of calcium is also a matter of debate. 500mg per day is probably adequate for bone health with 700mg per day for adults recommended in the UK (Willett et al., 2019). A healthy plant-based diet can provide adequate amounts of calcium as summarised here by the vegan society. In fact, the recently published Eat-Lancet Commission on Food, Planet Health accepts that dairy is not required in the diet (Willett et al., 2019) and the 2019 Health Canada dietary guidelines to not include dairy as an essential component of the diet (Health Canada, 2019).
For optimal bone health, everyone should make sure they are getting enough vitamin D, which in the winter months when sun exposure is limited, may be best obtained through supplements as recommended by Public Health England. Vitamin K is also essential for bone health and can be obtained from leafy green vegetables. Take care with protein consumption, as contrary to popular belief, more is not always better and high protein diets, especially when protein is from animal sources, have been associated with worse bone health and higher fracture rates (Feskanich, Willett, Stampfer, & Colditz, 1996; Sellmeyer, Stone, Sebastian, & Cummings, 2001).
Other lifestyle-related factors important for bone health include regular, weight-bearing physical activity, avoiding tobacco smoking and minimising alcohol consumption (Zhu & Prince, 2015).
In conclusion, medical evidence does not support the need for dairy in the diet and its continued promotion by those in authority should be openly challenged and underlying motives questioned.
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Health Canada. (2019). Canada’s Dietary Guidelines. Retrieved from https://food-guide.canada.ca/static/assets/pdf/CDG-EN-2018.pdf
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Ludwig, D. S., Willett, W. C., Volek, J. S., & Neuhouser, M. L. (2018). Dietary fat: From foe to friend? Science. https://doi.org/10.1126/science.aau2096
Ma, J., Giovannucci, E., Pollak, M., Chan, J. M., Gaziano, J. M., Willett, W., & Stampfer, M. J. (2001). Milk intake, circulating levels of insulin-like growth factor-I, and risk of colorectal cancer in men. Journal of the National Cancer Institute. https://doi.org/10.1093/jnci/93.17.1330
Michaëlsson, K., Wolk, A., Langenskiöld, S., Basu, S., Lemming, E. W., Melhus, H., & Byberg, L. (2014). Milk intake and risk of mortality and fractures in women and men: Cohort studies. BMJ (Online). https://doi.org/10.1136/bmj.g6015
Michels, K., Binder, N., Courant, F., Franke, A., & Osterhues, A. (2019). Urinary excretion of sex steroid hormone metabilutes are consumption of cow milk: a randomized corssover intervention trial. The American Journal of Clinical Nutrition, 109(2), 402–410.
Qin, L. Q., He, K., & Xu, J. Y. (2009). Milk consumption and circulating insulin-like growth factor-I level: A systematic literature review. International Journal of Food Sciences and Nutrition. https://doi.org/10.1080/09637480903150114
Sellmeyer, D. E., Stone, K. L., Sebastian, A., & Cummings, S. R. (2001). A high ratio of dietary animal to vegetable protein increases the rate of bone loss and the risk of fracture in postmenopausal women. American Journal of Clinical Nutrition.
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Zhu, K., & Prince, R. (2015). Lifestyle and osteoporosis. Current Osteoporosis Reports, 13(1), 52–59.
Disclaimer: The opinions expressed in this article are prepared in the author's capacity and do not necessarily reflect the views and opinions of Plant Based News itself.Reuse this content
Dr. Shireen Kassam is a Consultant Haematologist at King's College Hospital, London. She specialises in the care of people with lymphoma, cancer of the lymphatic system, but also cares for those with other haematological cancers. Her interest in the role of nutrition on health began when she became vegan for ethical reasons in 2013. Since then she has educated herself in the health promoting effects of a whole foods plant-based diet. She attended the International Conference of Nutrition in Medicine in 2016 and completed the eCornell certification programme in plant-based nutrition in 2017. She founded Plant-Based Health Professionals UK in 2017, an organization dedicated to the promotion of plant-based nutrition. Its mission is to provide evidence-based nutrition and lifestyle education to health professionals and the general public for the promotion of optimal health and well-being.
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