给一段文本内容： 

A Study on the Effects of Coffee Consumption on Academic Performance

Introduction:

Coffee is a popular beverage among students, especially during exam periods. However, the effects of coffee consumption on academic performance are still unclear. In this study, we aim to investigate this relationship and provide evidence-based recommendations for students.

Method:

We recruited 100 undergraduate students and asked them to report their daily coffee consumption for one month. We then categorized them into three groups based on how much coffee they consumed per day: low (< 1 cup), moderate (1-3 cups), and high (> 3 cups). We also asked them to submit their GPA for the previous semester as a measure of academic performance.

Results:

Our analysis showed that there was a positive correlation between coffee consumption and academic performance. Specifically, students who consumed moderate amounts of coffee had the highest GPAs, while those who consumed low or high amounts had lower GPAs. However, this correlation was only significant for students who reported a regular sleep schedule and no symptoms of anxiety or depression.

Conclusion:

Our study suggests that moderate coffee consumption may have positive effects on academic performance for some students. However, it is important to maintain a regular sleep schedule and be mindful of any symptoms of anxiety or depression.


根据这个文本内容回答问题：

根据这项研究，应该建议学生每天应该喝多少咖啡来提高他们的学术成绩？
根据这项研究，建议学生每天喝适量的咖啡（1-3杯）来提高他们的学术成绩，但是这种建议只适用于那些保持规律的睡眠时间并没有焦虑或抑郁症状的学生。同时，应该注意不要过量饮用咖啡，并在感到焦虑或抑郁时减少咖啡的摄入量。