Study Reveals Persistent Vitamin D Deficiency in Certain Populations Year-Round

The research, published in the European Journal of Clinical Nutrition, examined nearly 300 participants, showing that more than half of adults aged 65 and older had inadequate vitamin D levels. The deficiency rates were even higher among individuals from minoritized ethnic backgrounds in northern Britain.

Surprisingly, researchers found little to no improvement in vitamin D levels during the summer months, undermining the belief that increased outdoor activity during warmer weather replenishes vitamin D. This finding raises concerns for those living in northern regions, where sunlight is limited for much of the year. Factors such as age, skin pigmentation, clothing, and sunscreen use can hinder the body's ability to produce vitamin D. Older adults, in particular, produce it less effectively than their younger counterparts.

Professor Bernard Corfe, co-leader of the study, emphasized the need for a different approach in addressing vitamin D levels. He stated that simply spending more time outdoors in summer is not a solution for those at higher risk, such as older adults and minoritized ethnic groups. The study calls for consistent, year-round strategies to support adequate vitamin D levels.

The researchers suggest that public health initiatives should provide clearer guidance on vitamin D, promote routine discussions during healthcare visits, and consider appropriate supplements to help mitigate long-term deficiency risks. The next phase of the research will focus on personalized strategies, including tailored dietary advice designed to meet the needs of diverse communities.

This study was funded by Better You Ltd, a UK-based health company, which did not participate in the design or interpretation of the research.