A research conducted in Australia to measure serotonin levels in response to varying degrees of bright light has shown that the sun is the best natural antidepressant.
Serotonin is the hormone of happiness, whose lack is implicated in mental health problems such as depression. A study conducted in Australia by Dr. Gavin Lambert and his team measured blood samples of internal jugular veins from 101 men, comparing the concentration of serotonin in the blood with weather conditions and seasons.
The results revealed that under a bright light the production of serotonin multiplied by up to eight compared to cloudy and dark days. The effect is not cumulative, while the effects of light are immediate and beneficial for those under their exposure. In this way, the levels of this chemical were seven times higher in summer than in winter.
In fact, the lack of sunlight is a factor of depression in several Nordic countries, which suffer from lack of vitamin D requiring in many cases vitamin supplements to counteract cognitive deterioration or discomfort and bone and muscle pain, as well as a weakening of the system immune.
Natural light has such positive effects on health as improving mental health, by activating the neurotransmitters responsible for our mood, avoiding problems such as seasonal affective disorder (SAD), a form of depression triggered by the change of seasons. There is also evidence that exposure to the sun increases levels of vitamin B, which combined with D improves digestion and appetite, blood circulation, quality of sleep or the condition of the skin and bones.