Vitamin D protects against infections, cancer, and many different diseases, but there is a widespread deficiency problem. Also, the official recommendations for vitamin D intake are very low and are no guarantee of having optimal blood levels of the nutrient. A new British study that is published in Clinical Nutrition sheds light on the problems involved with helping an entire population to reach optimal vitamin D status. Apparently, there is no one-size-fits-all because age, gender, skin color, BMI, diabetes, and other factors can affect our ability to synthesize vitamin D and utilize the nutrient.

Schizophrenia is known to impair quality of life and reduce life expectancy. Diet, lack of nutrients, and digestion are all important for the progression of the disease, according to an Iranian study of schizophrenics who were given supplements of vitamin D plus lactic acid bacteria and bifidobacteria. The study is published in Neuropsychopharmacology Reports and reveals that these supplements were able to significantly improve the cognitive skills of the patients. The researchers also mention that these supplements have a role in regulating the body’s production of dopamine, controlling inflammatory processes, and controlling the gut-brain-axis that is important for the communication between the gut and the brain.

Most cells in the body have receptors for vitamin D, a nutrient that works as a steroid hormone. The different immune cells in the body are particularly dependent on vitamin D. Not only is this important for our ability to fight infections, but it also helps the body regulate inflammatory processes, which are the common thread in most chronic diseases and in ageing, according to a study that is published in Nutrients. The authors, Professor Carten Carlberg and Dr. Eunike Velleur, two of the world’s leading experts on vitamin D, explain why we need much more vitamin D than officially recommended when it comes fighting age.

Lack of vitamin B12 and folic acid increases the risk of Alzheimer’s disease, which is because these B vitamins regulate blood levels of homocysteine that must be below a certain threshold. Apparently, men and women react differently to B vitamins and folic acid with regard to cognitive functions, according to a study that is published in Nutrients. The risk of developing Alzheimer’s disease is also lower among younger people and among those who drink tea or coffee. Unfortunately, many older people lack these particular B vitamins because of poor diet habits, low stomach acid, or the use of various medical drugs.

There is a trending global shift towards vegetarian or vegan diets. However, these diets come with a risk of lacking essential nutrients that are primarily found in animal food sources. According to a large meta-analysis of Western diets, one of them is iodine. Iodine deficiency is a worldwide problem and has serious consequences because of iodine’s vital role in the thyroid function, energy production, estrogen balance, fertility, and healthy pregnancy outcome.

Hypertension and other cardiovascular diseases account for the majority of deaths. Diet and lifestyle are highly relevant, and it also appears that there is a significant linear relation between selenium intake and the risk of developing hypertension, according to a population study published in Frontiers in Immunology. The authors also mention selenium’s role in relation to blood pressure, and because selenium deficiencies are quite common, we need to look closer at this relation.

The two omega-3 fatty acids, EPA and DHA, which are found in oily fish and fish oil supplements are of vital importance to the child’s health and cognitive skills. However, according to a large American population study, 25 percent of pregnant women say that they rarely or never eat fish during their pregnancy, and even fewer take fish oil supplements. Lack of omega-3 during pregnancy can have serious consequences for the development of the child. Also, it increases the risk of postpartum depression in the mother. The study authors therefore advise pregnant women to eat oily fish or take a high-quality fish oil supplement.

Iodine is involved in the body’s production of thyroid hormones, and we humans need plenty of iodine throughout life, especially during periods such as fetal development and child development. Iodine is also important for brain development and cognitive skills. Severe iodine deficiency during pregnancy and during a child’s first years of life may result in stunted growth and/or mental retardation, but there has been uncertainty about how a minor iodine deficiency affects the child before and after birth. In a review article that is published in Nutrients, the authors look closer at iodine’s role in fertility and child growth. Apparently, iodine deficiencies are quite common, and we even need selenium and other nutrients to secure a well-functioning thyroid gland.