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Two young British women who considered themselves healthy collapsed without warning, and blood tests later showed severely depleted vitamin D levels, according to reporting by the BBC cited by FIT FOR FUN. Whether the deficiency caused either collapse remains unconfirmed. The cases have renewed attention on a nutrient shortfall that doctors say can build silently for years, particularly in adolescents and young women.
Saskia Reeves-Priestley, 23, played football four times a week, usually in goal. She told the BBC she had no reason to question her health until she suddenly went down at work, dizzy, nauseated, with a racing heartbeat and a body that felt abnormally hot. Testing later revealed what she described as a vitamin D level close to zero. She now takes supplements regularly and is back on the pitch.
The second case involved Amaka Osu, a 21-year-old student in Liverpool. While cooking dinner in her flat, she began shaking and her sight deteriorated until she could barely see. A flatmate took her to an emergency department. Her vitamin D readings also turned out to be low, though no link to her sudden symptoms was established.
Why it matters
Vitamin D deficiency is easy to miss because it rarely announces itself. Suma Uday, a British paediatric endocrinologist, described it to the BBC as a silent condition whose signs are vague enough to be blamed on almost anything else. For young people juggling study, work and training, persistent tiredness looks like ordinary life rather than a medical signal.
Osu made exactly that assumption. She told the BBC she had been exhausted long before the incident, but put it down to her schedule. "I'm a 21-year-old student. I have work and university — I'm always tired," she said. Since starting supplements, she reports feeling better, though she says the memory of that evening still frightens her.
The numbers suggest her experience is not isolated. According to the UK's National Diet and Nutrition Survey, nearly one in four adolescents aged 11 to 18 was deficient in vitamin D in the most recent data. Girls and young women are affected disproportionately, and British doctors are recording low levels in these groups with growing frequency.
Germany has its own version of the problem. FIT FOR FUN notes that deficiency is not rare among young people there either, citing a survey conducted between 2008 and 2011.
What the deficiency does to the body
Vitamin D helps the gut absorb calcium and keeps bones supplied with minerals. When levels stay low over time, bone structure can suffer. In osteomalacia, bones soften and fracture more easily. Uday warned that this weakening can progress gradually without early warning signs.
Geography compounds the issue in northern Europe. From October through March, sunlight in Germany is generally too weak for skin to produce meaningful amounts of the vitamin, because the sun sits too low for the UVB radiation the body needs. During those months, people draw down the reserves built up during sunnier periods.
Skin tone matters too. Under identical conditions, people with darker skin require more sun exposure to synthesise the same quantity. Clothing and sunscreen further reduce production, though both remain important for preventing skin damage. Oily fish contributes some vitamin D, but diet alone often cannot close the gap.
The German Federal Institute for Risk Assessment (BfR) recommends regular time outdoors, a balanced diet and supplements where needed as preventive measures.
A dispute over thresholds
British clinicians are now arguing about where the line for deficiency should sit. An expert group called ACT NOW Vitamin D, which includes Uday, is pushing for higher cut-off values, arguing that more at-risk people would be identified in time. There is no full consensus on the medically appropriate thresholds.
Martin Hewison, a professor at the University of Birmingham, raised a separate concern with the BBC: roughly a century after vitamin D was discovered, rickets has not disappeared. He called for consideration of mandatory fortification of foods. Canada and Sweden already require it; in the UK, fortification of many products remains voluntary.
One caveat worth keeping in view: taking vitamin D does not automatically prevent fractures. A review of 69 trials covering nearly 154,000 adults found little protective effect in most older people studied. That finding does not necessarily apply to people with a confirmed deficiency or specific medical conditions.
For now, the practical message from the reporting is that unexplained fatigue in otherwise fit young people may deserve a blood test rather than a shrug. Watch for further guidance from UK advisory bodies on testing thresholds and fortification policy.
