Sun for your health – the natural power of light

Sun and health: A natural boost of happiness – hormones triggered by light

Sunlight helps our brains release key neurotransmitters and hormones that influence our mood, sleep, and energy levels:

• Endorphins, known as “feel-good hormones,” relieve pain and elevate mood. They’re produced through sunlight exposure, physical activity, and pleasurable experiences, like tanning.
• Serotonin, often linked with depression when deficient, also rises with UV exposure. It helps regulate mood and maintain emotional balance.
• Melatonin, the sleep hormone, is naturally regulated by the cycle of light and darkness. Proper daylight exposure supports a healthy circadian rhythm, leading to better sleep and recovery.

That’s why gloomy days or long winters can leave us feeling low on energy and emotionally drained – and it’s no coincidence.

Vitamin D – the hormone of life – powered by sunlight

One of the most well-known benefits of UVB exposure is the natural synthesis of vitamin D in the skin. Though commonly called a vitamin, biologically it acts like a hormone and influences dozens of bodily functions.

Vitamin D:

• Aids calcium and phosphorus absorption, supporting bones and teeth.
• Regulates the immune system, reducing the risk of infections, autoimmune diseases, and inflammation.
• Has anti-cancer properties – playing a role in protecting against colorectal, breast, prostate, and other cancers,
• It supports the nervous system, improves mood, and protects against neurodegenerative diseases.

Importantly, 80–90% of our vitamin D needs come from the sun, not food. Supplements can help, but they don’t replace natural biosynthesis.

Cardiovascular health – natural support for the heart

UV light stimulates the release of nitric oxide (NO) from skin stores into the bloodstream. This molecule acts as a natural vasodilator, lowering blood pressure and improving circulation. The effects?

• Better oxygen delivery to tissues
• Lower risk of heart attacks, strokes, and atherosclerosis
• Potential reduction in blood pressure

In an era of rising heart disease and hypertension, responsible sun exposure can be a natural way to support cardiovascular health.

Immunity – strengthened by sunlight

Studies show UV light can act as a modulator of the immune system. That means:

• In small doses, it boosts immune defences by enhancing the activity of immune cells,
• It may reduce symptoms of autoimmune conditions such as multiple sclerosis, psoriasis, and Crohn’s disease.
• It helps the body fight infections (like the flu or COVID-19) by balancing cytokine levels and supporting lymphocyte activity.

Especially in autumn and winter, sunlight becomes a natural support for immunity, if we don’t cut it off completely.

Protection against modern diseases

Researchers around the world are uncovering more links between UV exposure (and vitamin D levels) and the risk of serious diseases, including:

• Cancers: colon, breast, prostate, lung, lymphoma, leukaemia,
• Neurological conditions: dementia, Alzheimer’s, depression,
• Metabolic disorders: type 2 diabetes, obesity,
• Bone diseases: osteoporosis, rickets
  Autoimmune diseases: MS, lupus, rheumatoid arthritis

And importantly, many of these benefits are not solely due to vitamin D – other mechanisms triggered by UV light at the cellular and genetic level also play a role.

Moderation – the golden rule

As with risks, the key to reaping benefits is moderation. Short, regular doses of sunlight (without burning) offer the greatest advantages.
Just a few minutes of daily sun on your face, arms, or legs can make a difference. And if that’s not possible, responsible use of sunbeds under controlled conditions may be an alternative, as long as you stay within safe UV exposure limits.

Summary: 7 benefits of light exposure

1. Improved mood and sleep thanks to endorphins, serotonin, and melatonin
2. Natural vitamin D production – supporting bones, immunity, and the nervous system
3. Better circulation and heart health through nitric oxide release
4. Immune system regulation – reducing infection and autoimmune risks
5. Protection against diseases of modern life: cancer, depression, diabetes, dementia
6. Prevention support for osteoporosis and rickets
7. A way to improve your quality of life.