The benefits of the sun.

• Stimulating the secretion of Vitamin D.

  Vitamin D is a fat-soluble pro-hormone, meaning it is a precursor to hormones. It exists in two forms: D2 or ergocalciferol and D3 or cholecalciferol. It is Vitamin D3 that is synthesised by the body following exposure to the sun's UVB rays. Just fifteen minutes of daily sun exposure is enough to cover 80 to 90% of the body's needs. This function of the sun is essential, as the body is not capable of naturally producing it. Yet, Vitamin D is crucial for its proper functioning, particularly for bone health. Indeed, low levels of Vitamin D have been associated with diseases such as osteoporosis and osteomalacia. Furthermore, Vitamin D strengthens the immune system.

• Lowering arterial pressure.

  In 2014, researchers demonstrated thata daily exposure of 30 minutes to sunlight reduces arterial pressureand therefore the risk of certaincardiovascular diseases.

• Ensure mental and physical well-being by guaranteeing a chronobiological balance.

  According to several studies, exposure to sunlight increases the brain's release of a neurotransmitter called serotonin (5-hydroxytryptamine), which contributes to feelings of well-being by regulating mood. In this regard, a low amount of serotonin is associated with a higher risk of major depression with seasonal pattern, triggered by changing seasons.

  Note : At night, a dimmer lighting triggers the release of another hormone by the brain called melatonin, which promotes sleep.
  

• Preventing certain types of cancer.

  Although excessive sun exposure can contribute to skin cancers, a moderate amount of UV rays has preventative effects on certain cancers such as those of the colon, pancreas, or prostate.
  

The sun can be beneficial, provided that exposure is moderate and protection is ensured with a broad-spectrum sunscreen. Indeed, unprotected sun exposure is the cause of sunburn, accelerated skin ageing (brown spots, wrinkles, fine lines...) and skin cancers. Furthermore, UVA rays damage elastic fibres, thus accelerating skin sagging.

It is recommended to expose oneself to the sun in the morning and to avoid tanning between 12pm and 4pm. A daily exposure of about fifteen minutes is sufficient to meet the needs of a day and stimulate the production of vitamin D.

Note : Sun exposure dries out the skin; it is therefore essential to hydrate it after a tanning session. For instance, you could use the 10-ingredient body cream.