Vitamin D is an extremely important vitamin that has strong effects on the human body. Unlike other vitamins, vitamin D acts like a hormone, and every single cell in our body has a receptor for it. It is also found in certain foods like fatty fish and fortified dairy products, although it is very difficult to get enough of it just from the diet.
The recommended daily intake of vitamin D is usually around 400-800 IU, but many experts say you should take more. Especially because vitamin D deficiency is very common and it is estimated that about one billion people worldwide have low levels of vitamins in their blood.
According to a 2011 study, 41.6% of adults in Americans are deficient in vitamin D, and these are the seven groups that are more likely to suffer from a deficiency of this vitamin:
- people who have dark hair
- elderly people who are overweight
- people who don’t eat a lot of fish or dairy products
- people who live in places with little sun
- people who always use sunscreen
- people who often and a lot stay indoors
Most people do not realize they have vitamin D deficiency because the symptoms are generally subtle and not easily recognized even though they have a significant and negative impact on quality of life, and these are the six most common symptoms.
Feeling tired can have many causes, and vitamin D deficiency can be one of them. Unfortunately, it is often overlooked as a potential cause. Case studies have shown that very low levels of vitamin D in the blood can cause fatigue which has a serious negative impact on quality of life. In one case, for a woman who complained of chronic daily fatigue and headache, the level of vitamin D in her blood was only 5.9 ng / ml. This is extremely small, as anything below 20 ng / ml is considered insufficient. When the woman took the vitamin D supplement, her level increased to 39 ng / ml and the symptoms disappeared.