Some have more serious symptoms such as bowel mal-absorption, abdominal pain, diarrhea and nutrient or vitamin deficiency.
Some succumbed to beriberi -- caused by a vitamin deficiency and easily treatable.
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.
This is not adequate evidence to show that vitamin D deficiency causes diabetes nor that vitamin D supplementation is a legitimate treatment for diabetes.
Growing evidence is suggesting that vitamin D deficiency is more common that previously believed, and that vitamin D may play an important role in many common diseases such as heart disease and cancer.
But in northern Europe, diseases related to vitamin D deficiency, such as rickets, would have become common.
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But is the prevention of severe vitamin D deficiency such as rickets all we need to know?
Taking too much folic acid - over 1mg a day - can mask signs of vitamin B12 deficiency.
The panel will also start work on collecting data to make recommendations on screening for vitamin D deficiency.
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He has written to health professionals about the risk of vitamin D deficiency.
Fully half of the 4, 000 to 5, 000 villagers exhibited lead-related illnesses ranging from vitamin D deficiency to neurological problems.
The college is to produce leaflets in a bid to raise awareness of vitamin D deficiency among the profession.
Vitamin D deficiency is common in people with poor diets (including obese people) and in people who are relatively inactive.
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.
Given our limed knowledge, recommendations on screening and treatment for vitamin D deficiency in reasonably healthy people are neither clear nor final.
He also pointed out that ricketts, a disease caused by vitamin D deficiency, has virtually disappeared in recent years, while Crohn's has soared.
Meanwhile, studies have shown that young athletes in northern European countries such as Britain, Finland and Germany often suffer from vitamin D deficiency.
Vitamin D deficiency has gained attention recently as a common problem.
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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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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".
Sight Savers International offers treatment such as cataract operations, to those whose sight can be saved, and educates healthcare workers about potential conditions which could cause blindness - such as vitamin A deficiency in childhood.
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.
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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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.
Vitamin B-12 deficiency can result from a diet lacking in vitamin B-12, which is found mainly in meat, eggs and milk.
Overall, those most at risk for a vitamin-D deficiency were older, female, obese, drank milk less than once a week, and spent more than four hours a day watching TV, playing video games, or working on a computer.
Vitamin B-12 deficiency anemia can also occur if your small intestine can't absorb vitamin B-12.
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.
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