What does the sun give us vitamin

Getting too much sun is dangerous for your skin. However, contrary to what sunscreen companies and vampires have led you to believe, getting some sun every day is actually quite good for you. The sun loads your body with beneficial vitamins and hormones. You can’t see it happening, but you can feel it. It’s there when you walk outside on a sunny day and you get that warm hug feeling right before your nice shirt is stained with pit sweat. Sunlight releases serotonin (the happiness hormone) in your brain, boosts your bone health, and actually might help treat several skin conditions. 

Have you ever wondered why you feel more irritable and moody in the colder months? Well, it might not only be because your favorite ice cream stand is closed and baseball season has ended. It could also be because you’re lacking sun exposure. When the sun hits your skin, your brain is triggered to release a hormone called serotonin. Serotonin is associated with boosting your mood and helping you feel calm and focused. Without sun exposure, your serotonin levels dip, which can be associated with a higher risk of major depression and generally feeling down in the dumps. So, before you start journaling about your feelings, and putting on that old Leonard Cohen album, try getting out in the sun and see how that makes you feel.

Vitamin D is another health benefit given to us by our oldest pal in the sky. Vitamin D plays a big role in bone health and low Vitamin D levels have been linked to rickets in children and bone diseases like osteoporosis. So how much sun do you need to get enough Vitamin D? It only takes 5-15 minutes of sunlight exposure on your arms, hands and face to get your daily value. The darker your complexion, the more time in the sun. Forget choking down a chalky vitamin every morning, just get outside for a bit and let the sun do its thing. 

Another benefit of the sun is that it can actually treat skin conditions. Now, you’ve probably been warned ever since you were a kid about the dangers of becoming a sunburnt lobster, so you might be wondering how the sun can actually treat skin conditions. Well, according to a little group called the World Health Organization, it’s true. Doctors have recommended UV radiation exposure to treat things like psoriasis, acne, jaundice, and eczema. So before you run out and start lathering your face with creams and wipes, give the sun a chance to play doctor.

Finally, it’s important to note that we do recommend sunscreen. If you’re going to be outside for more than 15 minutes, you should protect your skin. Applying a sunscreen of at least SPF 15 is a good idea.

Dr. Jared Heaton, a Dermatologist in Billings, Montana, says it's important to remember: "There is no such thing as a health tan. The best thing you can do to keep your skin looking young and healthy and prevent fine lines and wrinkles is to use sunscreen on your face daily."

Wearing a protective hat and shirt helps as well. But don’t let that stop you from getting some sun. Getting your daily dose of sun can also be a nice way to break up your day. Go for a walk, listen to the birds, and let the sun warm your skin. It’ll boost your mood, and as long as you don’t answer to a guy named Dracula, it’ll provide a myriad of health benefits. 

Vitamin D is created when the chemicals in our skin react to an invisible type of light from the Sun.

In Australia, most of our vitamin D is made in our skin, but we can can also get a little bit of vitamin D from some of the food we eat like fish, eggs and mushrooms.

Read more: Curious Kids: what does the Sun's core look like?

It’s important we have vitamin D in our body as it helps to strengthen our bones and make our muscles work properly.

It’s especially important in young people when their bones are growing.

Invisible and visible light

Let’s first talk a little bit about sunlight.

Sunlight isn’t just the golden light that wakes you up in the morning or shines on your skin on a summer’s day. Sunlight actually exists in many colours, some we can see and some we can’t see.

A rainbow is an example of visible light, or sunlight you can see. Droplets of water in the sky split the light into all of its different colours.

But not all light is visible like the many colours of the rainbow.

Some types of sunlight are invisible. Infrared sunlight is one of these. If you could see infrared sunlight it would sit just above the red in the rainbow.

Infrared light makes us warm as it produces heat. You might have felt it heat up your skin on a warm sunny day.

Read more: Curious Kids: does the Sun spin as well as the planets?

Another type of invisible light is ultraviolet. If you could see ultraviolet light it would be below the violet colour in the rainbow.

Ultraviolet light is also called UV light, or UV radiation.

You might be interested to know that while we can’t see infrared or ultraviolet light, most animals can. In fact, goldfish can see both infrared and ultraviolet light. Imagine what that might be like!

Which light is important in making vitamin D?

We often use something called the UV index to tell us how much UV light is outside. The UV index is sometimes reported with the weather forecast, and tells us how strong the UV radiation will be that day.

There are two types of UV light that reach us from the Sun, called UV-A and UV-B. But it’s only the UV-B light hitting our skin that causes vitamin D to be made.

UV-B light is full of energy, a bit like a child who can’t sit still. It has more energy than UV-A and that extra energy is needed to make vitamin D.

So how exactly is it made?

When the UV-B light hits your skin, the energy in the light combines with chemicals in the very top layer of your skin.

Sometimes this results in your body making vitamin D. Other times the combination makes bad chemicals that lead to sunburn, and maybe later to skin cancers.

Read more: Curious Kids: why don't burns bleed?

When the UV-B energy is taken into a chemical, it gives the chemical more energy – scientists describe this as the chemical being “excited”.

When the heat from the infrared light is added, it gives the excited chemical even more energy – so much that the links holding the chemical together break apart and it changes into a totally different chemical.

Imagine joining hands with all your friends and making a big circle, then running madly around. Some people lose their grip and their hands come apart. Suddenly it’s not a circle anymore, but a different shape.

This is what happens in the skin. The chemical that takes in the UV-B changes, because the links between atoms in the circle break, to become vitamin D.

The vitamin D is then picked up by the blood that flows through the skin.

But before it works properly in the body it has to go to the liver and then to the kidneys where it turns into the form that can help our bones and muscles.

Read more: Curious Kids: why is the Sun orange when white stars are the hottest?

But be careful not to get sunburned

So getting some sun on your skin is really important, but you don’t want to get too much or you’ll get sunburned.

In summer in Australia, the sun is so strong that you only need to be outside for a few minutes every day to keep your vitamin D up.

But it’s still good to get plenty of time outside, especially in the morning and afternoon.

Make sure you use sun protection like a hat, clothing, and sunscreen if the UV index is 3 or higher.

In summer it’s best to stay indoors or in the shade in the middle hours of the day because the Sun is very strong. But in winter the Sun’s not as strong, so the middle of the day is a good time to get outside in the sun to get your vitamin D.

Hello, curious kids! Have you got a question you’d like an expert to answer? Ask an adult to send your question to [email protected]

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