Скачать или смотреть ILA 2018 - Johan Emilian Moan - Sun and Sun Beds: Health-bringing or Dangerous?

Presentation given by Professor Johan Emilian Moan at the International Light Association 2018 Conference, in Oslo, Norway.

Sun and Sun Beds: Health-bringing or Dangerous?

Solar radiation is the main cause of skin cancer. However, solar radiation falling on skin is also the main source of vitamin D for humans. Furthermore, a number of other positive effects of sun exposure have recently been found, including: CO and NO generation, resistin break-down, and formation of adenocorticotropic hormone (ACTCH) filagrin and of brain derived neurotropic factor (BDNF).

It has also been shown that sun beds are excellent vitamin D sources: just 10 minutes exposure twice weekly will bring a winter level of vitamin D up to a summer level which is 30 – 50 % higher. A good status of vitamin D protects against internal cancers and a number of other diseases, but, a controversy exists: Will increased sun and/ or sun bed exposure lead to net health benefits or risks? I will discuss this controversy and conclude that considering all until now known effects of UV (sun and sun beds), a moderate increase in exposure would lead to more positive than adverse health effects.

Evolutionary considerations strongly support this. Human skin colour has every time humans have migrated from equatorial regions changed from dark to white: In white skin six times less UV is needed to produce the same amount of vitamin D.