Many people in England who are at higher risk for low vitamin D may never get enough, no matter the season, says a new study. The research challenges the common belief that summer sunshine alone can fix the problem.
Scientists at Newcastle University checked the vitamin D levels of almost 300 residents from the north of Britain. The group included adults over 65 and people from minoritized ethnic backgrounds of all ages. The study was funded by a UK supplement company, but the researchers worked independently.
Vitamin D Deficiency Stays High All Year
The results showed that more than half of the older adults had insufficient vitamin D. The rate was even higher among participants from minoritized ethnic groups. Surprisingly, levels did not rise during the summer months.
Vitamin D helps keep bones strong and supports overall health. Low levels are linked to osteoporosis, rickets, and a weaker immune system.
"It is striking that vitamin D didn’t improve in summer," said Professor Bernard Corfe, a co‑leader of the study. "For people living in northern England, sunshine alone may not be enough, especially for older adults and ethnic minorities. The simple message is: you cannot rely on summer sun to solve the problem."
Calls for Better Public‑Health Actions
Participants were recruited locally and online. Each person gave a tiny finger‑prick blood sample, which was analyzed by a specialist lab.
The researchers suggest clearer guidance, quick vitamin D checks during doctor visits, and targeted supplements when needed. They also plan to test personalized ways to raise vitamin D, such as diet advice that fits cultural preferences.
All research was carried out by Newcastle University without influence from the funding company.