You have three types of coffee: what kind of team do you belong to?

The Coffee Information Science Institute's study will explain why you can not sleep after a cup of coffee. In the afternoon, some people are OK.

The answer depends on your genes for caffeine and two important factors determine whether your body has Reacts with caffeine. The first is the speed of metabolism, and secondly, changes in nervous system responses to caffeine.

Dr. JW Langer, president of Denmark's Copenhagen University's research team, has identified three coffee drinkers:

1. Has high reactions to caffeine

People in this group are hard to sleep after drinking a cup of coffee in the afternoon because of the high reactivity of the nervous system. For caffeine and metabolism slow, so the people in this group do not want to portraiture should not eat coffee apart from In the morning.

2. There is a normal reaction to caffeine

People with genes that have digestive and nervous systems adapt to caffeine. They are likely to be able to consume 2 to 5 cups of coffee per day without sleep problems but not Should eat after sunset.

3. There is less reaction to caffeine
People in this group have the fastest caffeine. They can drink coffee at all times. Coffee is not a problem for people in this group. But the researchers said they should not drink more than four cups a day.