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Children who consume plant-based milks don't grow as quickly as their dairy-drinking counterparts according to a study splashed across the tabloid papers today - but is this really the case?
According to this study of two-six year olds, for each cup of plant milk children consumed daily, they were on average 0.4 cm shorter than those who drank dairy milk.
At three years of age, the difference was 1.5 cm. The findings don’t show a cause and effect, only a potential link but the researchers are quick to warn against non-dairy milks.
The study results raise an important question about what’s normal and the effect of insulin-like growth factor 1 (IGF-1) from milk. IGF-1 is a hormone produced in the liver and body tissues of mammals and is naturally present in cow’s milk. IGF-1 in humans and cows is identical so the human body reacts to it in the same way – by accelerating growth.
Cow’s milk intake also stimulates a higher production of IGF-1 in the human body. But faster doesn’t mean better!
About two thirds of the entire human population don’t drink milk and, as long as the children are fed an adequate diet, grow perfectly well. What this new study shows is not children drinking plant based milks lagging behind; it shows how cow’s milk can unnaturally stimulate growth.
As a comprehensive review of science on the subject pointed out, regular cow’s milk intake indeed seems to enhance growth early in life, particularly before five years of age and in adolescence. It has also been associated with early menarche (age of the first period in girls), which is a risk factor for hormone sensitive cancers later in life. The author concludes that routine cow’s milk consumption can alter some aspects of human development leading to negative long-term consequences.
Consuming cow’s milk is unnatural for humans and studies like this one only show how profound the effects can be. Many people jump to the conclusion that bigger means better and surely, the dairy industry will try to use this study to their advantage, yet nothing can be further from the truth.
Veronika Powell MSc is a researcher and campaigner at Viva! and Viva!Health specialising in the links between diet, health and disease. Veronika is a biologist and a qualified teacher; she has worked on a number of major campaigns since 2004. After spending several years campaigning against animal experiments working with schools, universities, cosmetics companies and politicians, she moved on to vegan nutrition and health to show people that a plant-based diet is the best possible. Her research and campaigning efforts have been focused on diabetes, bone health, benefits of vegan diets and also the dairy industry in the recent years, specifically on exposing the reality of dairy farming, its environmental impacts and the consequences of dairy consumption on human health.
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