Vitamin D Deficiency and Belly Fat Raise Death Risk

A study published in Diabetes, Obesity and Metabolism in early August 2026 has found that adults over 50 with both abdominal obesity and low vitamin D supplements levels face a substantially higher risk of death than those with neither condition. Researchers from the Federal University of Sao Carlos in Brazil, working with University College London, followed 5,520 adults aged 50 and over for six years using data from the English Longitudinal Study of Ageing. Participants with abdominal obesity, defined as a waist circumference above 102cm in men or 88cm in women, combined with vitamin D levels below 30 nanomoles per litre, had a 123% higher risk of death during the study period than participants with neither condition. Abdominal obesity alone was linked to a 47% higher risk of death, and low vitamin D alone to a risk up to 91% higher. The study is observational, tracking existing health measurements rather than testing an intervention, so it shows an association rather than proof that either condition causes death.

Why the two conditions may compound each other

The research team, led by Tiago Silva Alexandre of the Department of Gerontology at UFSCar, said the two conditions likely interact rather than simply add up. Abdominal fat can store circulating vitamin D supplements in fat cells, reducing the amount available in the bloodstream, and obesity is linked to lower activity of the enzymes the body needs to activate vitamin D. Alexandre, quoted by Medical Xpress, said "when these two conditions occur together, one amplifies the effects of the other, further increasing the risk of death." The study measured vitamin D status once at the start of follow-up rather than repeatedly, and neither report reviewed named a funding source for the analysis.

What this means for your supplement routine

This study measured vitamin D deficiency and waist circumference as they already existed in participants; it did not give anyone a vitamin D supplement, so it cannot show whether taking one changes the mortality risk reported here. Waist circumference and vitamin D status are both things a GP can check as part of routine health monitoring from age 50 onward, and blood tests are the only reliable way to know whether vitamin D levels are actually low rather than assumed. Anyone reviewing what is already in their supplement cupboard can compare current prices in the vitamins and minerals collection.

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This article reports published news and research and is for information only. Food supplements are not a substitute for a varied diet or medical care, and no product mentioned is intended to diagnose, treat, cure or prevent any disease. Speak to your GP or pharmacist before changing what you take, especially if you are pregnant, breastfeeding, or taking prescribed medicines.

Sources

• Combination of abdominal obesity and vitamin D deficiency more than doubles the risk of death in people over 50 - Medical Xpress
• Two Common Health Problems May More Than Double Death Risk After 50 - Newsweek

Originally reported by Medical Xpress. This article has been reviewed by Dr Tosin.