The report, in the journal PLOS Medicine, analysed genetic data from 21 studies – a total of 42,000 people.
It found every 10% rise in body mass index (BMI) – used as an indicator of body fat – led to a 4% drop of available vitamin D in the body.
As vitamin D is stored in fatty tissue, the authors suggest the larger storage capacity in obese people may prevent it from circulating in the bloodstream.
BMI it is calculated by taking weight (in kilograms) and dividing it by height (in metres) squared. Those with a BMI of 30 or above are considered obese.
Lead author Dr Elina Hypponen, from the University College London Institute of Child Health, said the study “highlights the importance of monitoring and treating vitamin D deficiency in people who are overweight or obese”. Continue reading Obesity can lower vitamin D levels in the body, a study suggests.
Greater access to cheap vitamin D supplements would improve the health of at-risk groups, experts say.
The Royal College of Paediatrics and Child Health (RCPCH) says up to 25% of UK children are vitamin D deficient, leading to a rise in rickets cases.
In the BBC’s Scrubbing Up column, the college’s Prof Mitch Blair called for concerted action to tackle the problem.
The government said those with the greatest need already received free supplements.
The RCPCH said other options to increase vitamin D levels, such as fortifying a wider range of foods, should be considered.
Half of the UK’s white population, and up to 90% of the black and Asian people in the country are thought to be affected by vitamin D deficiency.
The first signs of deficiency include muscle and bone pain as well as swelling around the wrists and ribs.
A lack of the nutrient is linked to a higher incidence of diabetes, tuberculosis, multiple sclerosis as well as rickets – a disease that causes bones to become soft and deformed.
The number of cases of rickets has been rising, from 183 in 1996 to 762 in 2011. Continue reading Cheap vitamin D ‘would boost health’