13-year-old children should not drink coffee. Although coffee is rich in nutrients and contains caffeine, it has a refreshing effect. After fatigue, lack of sleep leads to listlessness. Drinking a cup of coffee can improve work and study efficiency. Coffee can easily lead to the enhancement of sympathetic nerve excitability and increase the heart rate.

13-year-old children are growing and developing, with imperfect liver and kidney functions and poor detoxification ability. In addition, coffee contains substances that affect the absorption of iron, and children drink it for a long time, which easily affects the utilization of iron.