Spain is one of the European countries with the highest sun exposure. However, surprisingly, a large part of the population has insufficient vitamin D levels.
This seemingly contradictory phenomenon has sparked the interest of the scientific community in recent years. And the answer is not as simple as "not getting enough sun." In fact, the problem is much deeper and is directly related to the modern lifestyle and constant exposure to external substances known as xenobiotics.
What is vitamin D and why is it so important?
Vitamin D is a fat-soluble hormone essential for multiple bodily functions. Although traditionally associated with bone health, its impact goes far beyond.
Key functions of vitamin D:
· Immune system regulation
· Calcium and phosphorus absorption
· Reduction of inflammation
· Involvement in muscle health
· Influence on mood
A vitamin D deficiency not only affects bones, but can have systemic consequences.
The role of xenobiotics: the great silent enemy
Xenobiotics are external chemical substances that interfere with normal biological processes in the body.
Main sources of xenobiotics in our daily lives:
· Environmental pollution (air and water)
· Pesticides in food
· Plastics (BPA, phthalates)
· Cosmetics and hygiene products
· Medications
These substances accumulate in the body and alter key metabolic functions.
How xenobiotics affect vitamin D
The impact of xenobiotics on vitamin D occurs at different levels:
1. Interference with skin synthesis
The skin needs to receive UVB radiation to synthesize vitamin D. However, environmental pollution reduces the quality of this radiation.
2. Alteration of hepatic metabolism
The liver is responsible for transforming vitamin D into its active form. Xenobiotics interfere with this process.
3. Endocrine disruption
Some compounds act as hormone disruptors, affecting the overall function of vitamin D.
Result: even if you get sun exposure, your body may not be producing or utilizing vitamin D correctly.
Other factors explaining the deficiency in Spain
In addition to xenobiotics, there are other relevant factors:
Modern lifestyle
· Indoor work
· Excessive screen time
· Limited actual sun exposure
Constant use of sun protection
Although necessary, its continuous use blocks vitamin D synthesis.
Nutritional deficiencies
Few foods naturally contain vitamin D:
· Fatty fish
· Eggs
· Fortified dairy products
Symptoms of vitamin D deficiency
Many people have a deficiency without knowing it.
Common signs:
· Constant fatigue
· Muscle weakness
· Weakened immune system
· Bone pain
· Mood changes
How to improve vitamin D levels
Practical strategies:
· Controlled sun exposure (10–20 min/day)
· Diet rich in vitamin D
· Reduce exposure to toxins
· Supplementation under professional supervision
Conclusion
The problem is not the lack of sun, but the environment in which we live.
Understanding the role of xenobiotics is key to correctly addressing vitamin D deficiency in Spain.