Low selenium status increases a man's risk of prostate cancer and Danish men are particularly susceptible, according to a study published in British Journal of Nutrition. Earlier studies have shown that supplementation with selenium prevents prostate cancer, and selenium yeast has been shown to have the best effect.

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We all get exposed to mercury, a neurotoxin that is found to a great extent in nature and in our environment. According to an EU report, mercury is a large economic burden to society because of the costs related to lowered IQ levels. For that reason alone, we should aim to limit our exposure to mercury and also take a closer look at how selenium protects against the harmful heavy metal – provided our selenium levels are adequately high.

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Vitamin D deficiencies are very common. They increase children's risk of developing weak bones, but they also make adults more prone to osteoporosis.

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Many women experience sleep deprivation as one of the biggest problems of menopause. Not only does this condition cause fatigue, it also increases the risk of overweight, depression, impaired immune resistance, weak bones, atherosclerosis, and dementia. It is therefore a very good idea to solve any sleeping problem with the natural substance melatonin and a few other simple adjustments.

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Studies show that large quantities of B vitamins are able to slow mild cognitive impairment, which is an early stage of dementia and Alzheimer's disease. A more recent study suggests, however, that B vitamins are not effective, unless the body is properly supplied with the omega-3 fatty acids that are found in fish oil.

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Recent studies show a possible relation betwen too little vitamin D and the risk of developing autism. It is also alarming that many children are born with too little vitamin D or develop a deficiency later in life, as vitamin D controls numerous processes in the human brain.

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