Selenium is a trace element with a number of essential functions. An estimated one billion people worldwide get too little dietary selenium. The problem is mainly a result of nutrient-depleted farmland. Moreover, blood levels of selenium drop drastically in connection with COVID-19 infections, serious illness, and pregnancy because the body has an increased need for the nutrient. Altogether, selenium deficiency increases the risk of complicated COVID-19 infections, autoimmune diseases such as rheumatoid arthritis, Hashimoto’s thyroiditis, preterm delivery, and miscarriage. Supplementation may help optimize blood levels of selenium, which can be relevant for preventing and treating a number of common diseases, according to an article that is published in International Journal of Medical Sciences.

The number of seniors worldwide is increasing and more and more are affected by Alzheimer’s disease, the leading cause of dementia. We should therefore focus much more on this health problem that comes with an enormous human and socio-economic price tag. According to a new meta-analysis, supplementation with B vitamins appears to prevent or delay mild cognitive impairment in older people, which is normally an early sign of Alzheimer’s disease. In fact, supplementation with B vitamins may even represent an inexpensive therapy form with a huge potential.

Vitamin D is essential for the immune defense. Because deficiencies of the nutrient are becoming increasingly common and vaccines only have limited effect, we can expect new waves of COVID-19 during the winter period. Vitamin D counteracts chronic inflammation which is seen in rheumatoid arthritis, diabetes, and other chronic diseases. Multiple studies have shown a link between low blood levels of vitamin D and the occurrence of these diseases. In a new meta-analysis that is published in Molecular and Cellular Biochemistry, scientists look closer at the scientific data for risk factors involved with vitamin D deficiencies and the advantages of taking vitamin D supplements in connection with COVID-19, rheumatoid arthritis, and other inflammatory diseases.

- and could potentially be used for prevention and treatment

It is commonly known that omega-3 fatty acids are involved in a number of essential functions in the body. One of the fatty acids, DHA, may even have a toxic effect on cancer cells because they are unable to store the fatty acid correctly. In a new Belgian study published in Cell Metabolism, scientists explain the exact mechanisms. They also suggest that omega-3 supplements may be useful in cancer therapy, especially because the average omega-3 intake from the diet is far too limited and because there is a risk of becoming resistant to medical cancer drugs. The new study puts omega-3 fatty acids and their anti-cancer effects in a whole new light.

During World War II, food supplies were scarce. At one point, English researchers wanted to find out how little vitamin C it would take to prevent the potentially lethal disease, scurvy. In order to do that, they carried out a drastic experiment that later served as basis for our current vitamin C recommendations. However, a recent analysis of this old study has revealed that the actual need for vitamin C is a lot greater than previously thought, suggesting that WHO raise the recommended daily intake level. The question is how much vitamin C do we really need and what good does the vitamin do?

Oily fish and fish oil have a high content of the two omega-3 fatty acids, EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid), that are important for our brain, nervous system, intelligence, and mental health. Modern diets, however, are to blame for our lack of omega-3. A team of scientists from England has found that supplementation with EPA-rich fish oil for 26 weeks improves mental acuity and reaction time in healthy, young adults. This was not the case with DHA-rich oil fish oil, on the other hand. The scientists were surprised to find that EPA is more important than DHA for these cognitive skills.

Colorectal cancer is one of the most common cancer forms in Denmark, which is why prevention is so important. According to a new American study that is published in Gastroenterology, increased intake of vitamin D appears to protect against bowel cancer, especially in people younger than 50 years. It even looks as if vitamin D may prevent intestinal polyps that can turn into cancer in some cases. The scientists say that higher intake of vitamin D may be relevant for prevention and may also serve as an inexpensive supplement to screening tests that are merely used for early diagnosis.

Type 1 diabetes can eventually lead to eye damage and if this is not discovered in time it may cause blurry or impaired vision. According to a new study that is published in Diabetes, supplementing with omega-3 for six months can regenerate damaged corneal nerves, so the scientists believe that eating more oily fish or taking a fish oil supplement may represent a promising add-on to existing therapies.

Sales of plant-based meat, also known as meat analogue, has increased for environmental reasons and a number of other reasons. However, even if meat analogue does resemble regular animal meat it has an entirely different nutritional value. According to a study from Duke University in the United States, real meat contains 22 different nutrients and metabolites that you do not get from meat analogue. On the other hand, meat based on vegetarian sources contains 31 nutrients and metabolites that are not found in normal meat. The largest difference between the two, according to the scientists, lies in their content of amino acids, peptides, vitamins, phenols, and fatty acids. The researchers also mention that a diet based on vegetable and animal products is complementary because it contains more nutrients.

More and more people experience despair and depression. There can be several underlying factors but according to a large German population study, lack of vitamin D increases the risk of depressive symptoms. The scientists explain how vitamin reduces local inflammation in the brain, which increases the risk of developing a depression. That is why it is so important to get plenty of vitamin D all year round because the nutrient affects our mood and energy level in a variety of ways.

Multiple studies have shown that zinc and a zinc-containing protein named ZAG are involved in lipid metabolism, satiety, and weight regulation, but zinc deficiencies are widespread, and having too much body fat can reduce blood levels of zinc, thereby increasing the risk of overweight and disturbances of the lipid metabolism. In a recent review article that is published in Nutrients, scientists look closer at zinc’s role in the lipid metabolism and why overweight people often lack zinc. The authors call for increased focus on zinc and end up concluding that it would be obvious to include zinc supplementation in the treatment of disrupted lipid metabolism and overweight.