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研究显示,肥胖会降低体内维生素D含量。
The report, in the journal PLOS Medicine, analysed genetic2 data from 21 studies - a total of 42,000 people.
It found every 10% rise in body mass index (BMI) - used as an indicator3 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 obese4 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".
Vitamin D is made in the skin after sun exposure and can be taken in dietary supplements.
Healthy levels are about 50 nanomole per litre - less than 30 nanomole per litre can cause the softening5 and weakening of bones, leading to rickets6(佝偻病) in children and osteomalacia(软骨病) in adults.
Prof David Haslam, from the National Obesity Forum7, said: "Food intake8 and genetics all play a part in obesity - but this research is a reminder9 that physical activity, like walking the dog or going for a run out in the sunshine, shouldn't be forgotten and can help correct both weight and lack of vitamin D."
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