In the last 10 years, doctors have been seeing more cases of vitamin D deficiency, leading to a debate over the use of food supplements and concern that many medical staff are unaware of the problem.
Taking too much folic acid - over 1mg a day - can mask signs of vitamin B12 deficiency.
He has written to health professionals about the risk of vitamin D deficiency.
The college is to produce leaflets in a bid to raise awareness of vitamin D deficiency among the profession.
People at risk of vitamin D deficiency, including pregnant women and children under five, are already advised to take daily supplements.
Stephen Nussey, professor of Endocrinology at St Georges Hospital in London, explained that rickets is a severe aspect of vitamin D deficiency.
Her exam revealed inordinately high levels of gastrin--an indicator of atrophic gastritis or pernicious anemia, a deficiency of vitamin B12.
But is the prevention of severe vitamin D deficiency such as rickets all we need to know?
Professors Brian Wharton and Ian Booth, from the Institutes of Child Health in London and Birmingham, warned that in people with vitamin B12 deficiency, consumption of folic acid may mask a condition called megaloblastic anaemia - which if not picked up can lead to degeneration of the spinal cord.
Deficiency of this vitamin can lead to very unhealthy results, and yet it is only naturally found in animal products.
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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".
Pregnant and breastfeeding women in the UK are currently advised to take daily supplements of vitamin D to protect against deficiency, but whether this advice has been successful or not has never previously been studied in Scotland.
Not only can this lead to an increased risk of fractures and osteoporosis in general, but vitamin D deficiency has also been cited as a contributor to increased rates of diabetes, cancer, and cardiovascular disease among African-Americans.
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Having a vitamin deficiency (such as of calcium or magnesium) may be linked with teeth grinding, so it's important to follow a well-balanced, nutritious diet and take a multivitamin supplement if needed.
Whether or not Clemens can demonstrate a vitamin B-12 deficiency, he is going to have to contend with questions about why chose injections of a vitamin that is found naturally in meat, fish and dairy products or in commercially-produced and readily-available pill form.
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Vitamin B-12 deficiency anemia caused by a lack of intrinsic factor is called pernicious anemia.
Vitamin D supplements are recommended for all people at risk of a deficiency, including all pregnant and breastfeeding women, children under five years old, people aged over 65, and people at risk of not getting enough exposure to sunlight.
However, a vitamin B-12 deficiency is most often due to a lack of a substance called intrinsic factor.
We see high HgA1Cs that are accurate measurements, but not reflective of glucose control in people with low red cell turnover from iron, vitamin B12 or folate deficiency.
So I would be especially concerned about vitamin D deficiency in young African-American men who have likely spent much of the last few winter months on indoor basketball courts and in indoor classes.
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Fully half of the 4, 000 to 5, 000 villagers exhibited lead-related illnesses ranging from vitamin D deficiency to neurological problems.
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