http://www.bbc.co.uk/news/health-15165497
useful expressions:
measure their vitamin D level
behaviour
figure
take supplements
pale skin
don't seem to be able to
people should be aiming for
some level of uncertainty
essentially
may also need to consider that
excrete
fortified foods
overdose
who should be taking extra supplements
in terms of their risk of cancer
sunburn triples the risk of melanoma
never getting sunburnt
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