New research from Newcastle University's Human Nutrition and Exercise Research Centre indicates that many individuals in England at higher risk for vitamin D deficiency may not achieve adequate levels of this nutrient throughout the year. The study challenges the prevailing notion that summer sun exposure alone is sufficient for maintaining healthy vitamin D concentrations.
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The research examined vitamin D levels in nearly 300 residents across northern Britain, with a focus on adults aged 65 and older as well as individuals from minoritized ethnic backgrounds. The results highlighted that a substantial number of participants could remain vitamin D deficient year-round, potentially affecting bone health and overall well-being.
Published in the European Journal of Clinical Nutrition, the study found that over half of the older adults surveyed had insufficient vitamin D levels, a statistic that was even higher for participants from minoritized ethnic groups. Notably, the findings showed that vitamin D levels did not improve during the summer months, contradicting the assumption that increased sunlight would suffice to restore healthy levels.
Vitamin D plays a crucial role in maintaining healthy bones and overall health; insufficient levels are linked to an increased risk of osteoporosis, rickets, and diminished immune function. Professor Bernard Corfe, co-leader of the study, emphasized the startling nature of these results, stating that levels did not rise even during summer, suggesting that sunlight exposure may not be adequate, especially for older adults and those from minoritized backgrounds.
Corfe noted, "The message is simple but important. If you are in a higher-risk group, you can't assume that spending more time outdoors in summer will solve the problem. We need to think about more consistent, year-round ways to support healthy vitamin D levels."
The study also calls for targeted public health measures, including clearer guidelines, brief vitamin D assessments during general practitioner visits, and appropriate supplementation. The research, which was conducted independently, adds to the limited understanding of year-round vitamin D risks among vulnerable populations.
Future phases of the project will explore personalized and culturally sensitive strategies for improving vitamin D levels, which may involve tailored dietary recommendations and healthcare approaches suited to different communities. Better You Ltd, a UK-based health and wellness company, funded the study but did not influence its design or results.