The body’s vitamin D status can be used to predict the risk of contracting COVID-19, developing serious symptoms in the acute disease phase, and dying of its complications. This was demonstrated in a large Chinese study, where majmost of the hospitalized COVID-19 patients lacked vitamin D.

Iron is vital for red blood cells and their ability to carry oxygen, for energy turnover, and for muscle function. For those reasons, iron is highly important for athletes because iron deficiency anemia impairs your performance. Still, iron deficiency is quite common, especially in connection with endurance sports and menstrual bleeding. A plant-based diet and low stomach acid can also increase the risk of becoming iron-deficient. In a new review article that is published in Life, a group of scientists has looked at iron and iron supplementation and how it can affect athletic performance.

There is a link between vitamin D deficiency and sclerosis. However, only few studies show whether vitamin D supplements can stop further progression of the disease. A new placebo-controlled study of rats with advanced sclerosis has looked closer at the connection. The study, which is published in Nutrients, shows that vitamin D supplementation counteracts oxidative stress, chronic inflammation, and other processes that are involved in the neurological damage seen with this disease. It is important that vitamin D supplementation aims at optimizing blood levels of the nutrient, which requires higher doses than officially recommended. It also requires enough magnesium to help activate vitamin D and support the nervous system.

Refined foods and plant-based diets lack vital nutrients that are highly important for a pregnant woman and the development of her unborn child’s body and brain. This was shown in a large study of mothers from high-income countries, where 90 percent of the participants lacked key nutrients such as vitamin B2, vitamin B6, folic acid, vitamin B12, and vitamin D. These widespread deficiencies have huge health consequences, which may be irreversible for the child. The scientists explain that the problem is made worse by the global push for eating more plant-based diets. Lack of omega-3 fatty acids that are primarily found in oily fish is also common and may harm the development of the child’s brain and increase the risk of postnatal depression in the mother.

Lack of vitamin D is linked to an increased risk of virus infections, respiratory diseases, cardiovascular diseases, dementia, cancer, and osteoporosis. However, the official recommendations for vitamin D intake are way too low, according to two new studies that were presented at the American Heart Association’s Scientific Sessions in Philadelphia in 2023. In addition, a German study of athletes has shown that it is better to take individually tailored vitamin D supplements to optimize blood levels of the nutrient instead of using a “one-size-fits-all” solution.

Fetuses and children need various nutrients, including vitamin B12, to support the development of the body and brain. According to a study published in The American Journal of Clinical Nutrition, it is crucial to breastfeed the child for a period of at least six months to make sure it gets enough vitamin B12 from the mother’s milk. Most people get enough B12 from animal food sources. However, in countries and populations where people primarily consume plant-based diets, vitamin B12 deficiencies are common. The scientists behind the new study therefore recommend more focus on this specific area and recommend that pregnant and breastfeeding women take vitamin B12 as a supplement in case they don’t get enough from their diet.

The number of older people is increasing rapidly, which means more and more people suffer from different types of dementia. Vitamin D supplementation may help prevent dementia or delay its progression, according to a population study that is published in Alzheimer’s & Dementia: Diagnosis, Assessment & Disease Monitoring. It is important to have optimal blood levels of the nutrient throughout life, simply because it often takes years for dementia to develop, and because vitamin D has many different functions that are relevant for brain health.

In connection with tissue lesions, vitamin B12 boosts cellular reprogramming to speed up the healing process. This was shown in a Spanish study of mice with ulcerous colitis (bleeding inflammation in the colon). Based on this, the researchers assume that vitamin B12 supplementation may be useful for speeding up the regeneration of damage intestinal tissue. They mention that vitamin B12 may also help reduce the type of complicated inflammation that is seen with ulcerous colitis, and which contributes to the destruction of the intestinal mucosa. In this connection, it is important to remember that vegan diets lack vitamin B12, and that weak stomach acid and the ageing process can also inhibit the absorption of the nutrient.