Milk alternatives like soya milk and almond milk could leave consumers at risk of iodine deficiency, according to a study published in the UK.
Researchers from the University of Surrey found that a majority of milk alternatives do not have adequate levels of iodine, with concentrations found to be around 2% of that found naturally in cows’ milk. That would be particularly concerning for pregnant women, as iodine is essential for brain development in unborn babies.
Previous research from the same institute has linked low iodine intake in pregnant mothers with lower academic development in early childhood.
The study, published in the British Journal of Nutrition, has raised further questions about dairy substitutes. It comes after the UK’s National Osteoperosis Society warned consumers against removing dairy products from their diet completely, saying that the effect on bone health in later life could be seriously detrimental.
Margaret Rayman, professor of nutritional medicine at the University of Surrey, said: “Many people are unaware of the need for this vital dietary mineral and it is important that people who consume milk alternative drinks realise that they will not be replacing the iodine from cows’ milk, which is the main UK source of iodine. This is particularly important for pregnant women and those planning a pregnancy.
“A glass of a milk alternative drink would only provide around 2 micrograms of iodine, which is a very small proportion of the adult recommended iodine intake of 150 micrograms per day. In pregnancy, that recommendation goes up to 200 micrograms a day.”
And Dr Sarah Bath, lecturer in public health nutrition at the University of Surrey, added: “Milk alternative drinks are increasingly being used as a replacement for cows’ milk for a number of reasons that obviously include allergy or intolerance to cows’ milk.
“Worryingly, most milk alternative drinks are not fortified with iodine and their iodine content is very low. If avoiding milk and dairy products, consumers need to ensure that they have iodine from other dietary sources, where possible… If considering taking an iodine supplement, they should avoid kelp, which can provide excessive amounts of iodine.”
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