Regarding coffee, many people are worried that it contains caffeine, which is not good for people’s health. But here, drinking four to ten cups of instant coffee a day will not be excessive. These are not harmful to the normal human body. It will not have a certain amount of impact if taken in, and it has a refreshing effect. Office workers should consume between four and ten cups of coffee, and no more than ten cups. I personally think this amount is optimal.