Some people may think too much sunlight can lead to cancer (癌症), so they always keep themselves away from sunlight. But experts believe that proper exposure( 暴露 ) to sunlight is good for us. For example, scientists think sunlight can help stop some diseases. They say that wearing sunscreen( 防晒油 ) all the time makes the body short of vitamin D. Vitamin D in fact stops us from more than 25 diseases and keeps bones and teeth healthy. However, around 60% of the population are short of vitamin D in their blood. One of the easiest ways to get it is to expose your skin to sunlight. Your body makes vitamin D from the sun faster than it takes in from food. What’s more, safely getting enough sunlight can make you look younger. However, not everybody likes sunlight. Some people should not be exposed to the sun without a strong sun protection. Experts advise that just ten minutes of daily exposure to sunlight should be enough to give us vitamin D we need.