system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
Why do people need sunshine?


assistant
Ultraviolet waves from sunlight are absorbed through the skin as part of the process of producing Vitamin D. This is a critical vitamin for the immune system's ability to ward off disease, as well as for a person's hormonal balance. So sunshine can help make people both healthier and happier. On the other hand, too much sunshine can cause sunburn, which can make a person both unhealthy and unhappy.