Can caffeine really make us more efficient? Several studies have already looked into this question and come up with interesting results. In fact, there is clear evidence that drinking coffee or green or black tea has a positive effect on our reaction time, our memory and our attention span. Caffeinated foods are particularly popular with morning grouches or people who have to perform at high levels, and not without reason, because caffeine has a strong stimulating effect.

In addition to boosting mental performance, however, caffeine can also have a positive effect on our bodies. It boosts our metabolism, dilates our blood vessels and even has a preventive effect against type 2 diabetes.

What you should keep in mind,...