First, ensure adequate sleep. Adults spend seven or eight hours without going to bed at eleven and getting up at six. As long as you get enough sleep.
Second, you can eat whatever you want when you are hungry. Because of so many years of evolution, body form has developed a mechanism that whatever you want to eat is what you need (although it is not absolutely correct, it is true most of the time). Just be full at night, don't overeat.
Third, pay attention to hydration. Chinese medicine believes that staying up late is a great loss of body fluid. However, simply drinking water is not effective, and pears, oranges and other fruits with better moisture are good choices.
Generally speaking, as long as you have a regular life, a nutritious diet, adequate and efficient sleep and a positive attitude, you can be healthy. Don't pay attention to dogmatic health care, eat some messy health food.