This common vitamin deficiency becomes far more dangerous when paired with belly fat

A major study of over 5,500 adults aged 50 and above found that those with both abdominal obesity and vitamin D deficiency had a 123% higher risk of death compared to those without either condition, according to findings published in Diabetes, Obesity and Metabolism. While each condition was linked to a higher risk of death individually, their combined impact was significantly greater.

Abdominal obesity, characterized by a waist circumference over 102 centimeters in men and 88 centimeters in women, is a known risk factor for inflammation and metabolic issues. Vitamin D, a hormone affecting various organs, becomes deficient when its levels drop below 30 nmol/L. When these two health issues coexist, one exacerbates the effects of the other, further elevating the risk of premature death.

Professor Tiago Silva Alexandre, from the Federal University of Sáo Carlos in Brazil, led the study in collaboration with University College London, funded by FAPESP. The research monitored participants from the English Longitudinal Study of Ageing for six years. Alexandre suggests that abdominal fat may absorb circulating vitamin D, storing it in fat cells, rendering it unavailable in the bloodstream for vital functions.

Obesity also hampers the body's processing of vitamin D, reducing enzyme expression necessary for its metabolism. This combination is particularly concerning in older adults due to the inflammatory effects of aging, known as inflammaging, which is worsened by low vitamin D levels and excess abdominal fat. Vitamin D plays a crucial role in regulating the immune system, preventing uncontrolled inflammation.

The study, part of a series exploring vitamin D's impact on health during aging, also found that deficiency increases the risk of cognitive decline.