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ObeseObesity can lower vitamin D levels in the body, a study suggests.

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”.

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 softening and weakening of bones, leading to rickets in children and osteomalacia in adults.

Prof David Haslam, from the National Obesity Forum, said: “Food intake and genetics all play a part in obesity – but this research is a reminder 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.”

2013 Miles In 2013 – Please Sponsor Me

So after completing a year without all alcohol in 2012 for Cancer Research UK and the Cystic Fibrosis Trust I am now attempting to complete 2013 self powered miles by the end of 2013.

I am doing this challenge in aid of the Cystic Fibrosis Trust as I have been surprised since I started fundraising for the CF Trust just how many people are unaware of this disease and so I hope my efforts will not just raise money, but also awareness of the UK’s most most common life-threatening inherited disease.

The first person to commit to sponsoring my 2013 mile challenge has committed to 1p per mile (£20.13 in total) and this got me thinking. I am hoping that as many as possible of those reading this will commit to do the same and the best thing is, if each person does this on a “pay as you go” type approach all you will need to part with is approx £2 just after each pay day. In January I completed 205.9 miles, so if you can please spare £2.06 to help the Cystic Fibrosis Trust it will be greatly appreciated.

The easiest way to give your sponsorship is to visit my Just Giving page: http://www.justgiving.com/2012-AYearWithoutBeer-CF.

2013 Miles in 2013 – The rules

The rules for my 2013 miles in 2013 challenge are quite simple:

  1. All miles must be completely self powered (no motors, sails, etc)
  2. I must be able to evidence all miles, either via GPS or with a picture of any static gym equipment

To complete my 2013 miles I will be running, cycling, rowing and who knows, I might even try a few other self powered methods along the way.