There are times that everyone wants to be in a better mood. But how can we become happier?

Think sunshine.

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One of the primary factors that help people feel better is vitamin D. And today, many of us stay inside most of the time due to work. We work eight to 10 hours a day in an office building with artificial light. This is in contrast to our earliest ancestors, who were outside foraging most of the day. Ancient man was a gatherer who stayed outside from sunup to sundown.

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The modernization of mankind has allowed us to live comfortably indoors for much of the time. However, we have lost our time outdoors, during which we once made much-needed vitamin D.

Why is vitamin D so important, anyway? It is necessary for the regulation of cell growth. And it’s imperative for a healthy immune system. Combined with calcium, it helps to protect our bones from becoming brittle.

And having enough vitamin D can help lower the symptoms of depression.

So if you are feeling depressed, you can see how vital it is to get enough vitamin D. Try going out into the sun for 30 minutes a day. This is a very simple and easy thing to do. Just be certain to protect your skin with an SPF of at least 30 or higher.

And wear sunglasses to protect your eyes.

Related: You Need Vitamin D, but Not This Way

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Even just a few minutes in direct sunlight without protection can damage your skin and cause unsightly sunspots, wrinkles, and premature aging.

Also, remember to get enough sunlight in the wintertime, when the sun is scarce. By getting enough natural sunlight each day, your mood will improve, you’ll feel healthy — and depression will be kept at bay.