A June 2019 study by Trinity College Dublin found that, “Over a quarter of adults aged 50+ are deficient in vitamin D” and “Vitamin D deficiency is prevalent in older adult populations living at Northern latitudes”

“Our study identified factors associated with vitamin D deficiency, including being aged 80+ years, obesity and sedentary lifestyles; all of which are increasing traits in western populations.” said Professor Maria O'Sullivan

Dr Niamh Aspell said, “Those who used a vitamin D supplement, were less likely to be vitamin D deficient as may be expected, but supplement use was low (4.4%) …”