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Vitamin D - Vitamin D is very important for the health of your bones and teeth. Do you know what makes your body produce this vitamin? The answer is, the sun!

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Vitamin D - It is more common for people who live in cloudy cities to suffer from vitamin D deficiency.

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Vitamin D - Sun exposure is advised at times when the sun is not at its peak of intensity, for periods of 15 minutes.

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Vitamin D - In addition to improving calcium absorption, Vitamin D also improves your mood.

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Vitamin D - This vitamin also helps to reduce the risk of developing cancer, heart disease, strokes, and diabetes.

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Vitamin D - Because it relaxes blood vessels, vitamin D also improves blood circulation and lowers blood pressure.

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Sun - Sunlight is also critical for the production of the hormone melatonin, which is responsible for regulating our biological clock.

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Sun - If you have trouble sleeping early and getting up early, sunbathing can help you with this too!

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Stress - Our daily lives, which can be overloaded with activities, problems, tasks, worries, and commitments, cause us stress, depression, and anxiety.

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Stress - One way to avoid your stress levels from rising is to find a way to be in closer contact with nature and empty your mind.

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Concentration - Too much technology and information makes it difficult for us to concentrate.

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Concentration - A study by the University of Wisconsin has revealed that, for many people, to spend time in touch with nature is a great way to forget about the problems and stress of everyday life and get more focused.

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Brain activity - As much as our brain can process many activities at the same time, it also needs rest.

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Brain activity - The brain needs 20% of all the energy the human body produces, and this value increases by up to 10% when we need to focus on some kind of mental challenge. And even when we are relaxing, the brain continues to work.

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Brain activity - When people's minds wander, which happens more frequently when in contact with nature, their brains enter a state known as the Default Mode Network, which is a complex coordinated communication system between all parts of the brain.

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Brain activity - This activity is critical during the process of developing and understanding human behavior.

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Hands on the land - A Dutch study has found that spending time in nature and performing tasks related to it, such as gardening or farming, is a better stress reliever than any other leisure activity.

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Get your hands dirty - To reach this conclusion, the researchers divided people into two groups. One group sat indoors, reading, while the other did gardening for 30 minutes.

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Get your hands dirty - People in the gardening group had better moods than those who sat indoors reading.

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Get your hands dirty - The study also revealed a decrease in cortisol production, a substance known as the 'stress hormone.'

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Pollution - When we are indoors or exposed to a lot of pollution, our body needs to work harder to get the oxygen it needs.

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Pollution - This extra work will increase your heart rate and blood pressure.

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Breathing - Breathing exercises also decrease the production of stress-related hormones.

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Breathing - Accelerated breathing helps the body to become alert and therefore stressed. Slow and deep breaths on the other hand, are able to make you calmer quickly.

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Serotonin - Serotonin is a neurotransmitter known to affect our mood, appetite, memory, social behavior, and other important processes.

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Serotonin - The better the oxygenation in your brain is, the higher serotonin levels become. Too much serotonin however, may cause tension and irritability.

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Serotonin - But if serotonin is low, you will become depressed.

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Fresh air - Breathing fresh, pure air helps regulate serotonin levels and promote feelings of happiness and well-being.

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Fresh air - The air of unpolluted environments increases the amplitude of brain waves, which creates an immediate tranquilizing effect.

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Soil - Soil is also a source of energy and joy. Research from the University of Colorado has revealed that a harmless bacteria found in soil can act as a kind of natural antidepressant.

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Soil -

This is because the microorganism makes us produce more serotonin, which is good for the immune system.

See also: Bioinspiration: how nature is helping us innovate

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