How and why does vitamin D deficiency develop?

Above all, lifestyle is decisive: few stays in the fresh air and thus no direct UV radiation are reflected in a low vitamin D content. In addition, heavy metal pollution in the body can play a role, for example through smoking. Such chronic stresses can lead to a blockage of vitamin D activation. Biological age also has an influence, as kidney function, which is important for vitamin D metabolism, decreases over the years. For this reason, older people in particular should make sure that they get enough exercise in the fresh air. Seasons and latitude also influence vitamin D levels: low sun intensity in winter and short periods of sunshine have a negative effect. Digestive disorders can also play a further role: chronic liver and/or gallbladder diseases and disorders of the digestive tract, through which fats are poorly absorbed, reduce the absorption and storage of vitamin D.