Scientists have discovered that there are three types of coffee drinkers depending on the way their livers metabolize caffeine.
The new research explains why some people can have a cup of java before bedtime and have no trouble falling asleep while some people get the jitters from a single expresso early in the morning.
It all depends on their sensitivity to caffeine, the research team explained.
In the study, researchers sifted through existing research to better understand how different bodies process caffeine and why some people are more sensitive to it than others.
Study authors found that caffeine sensitivity largely depends on genetic factors, which influence how fast the liver can metabolize caffeine and how the central nervous system responds to the stimulant.
The 3 Types of Coffee Drinkers
The new study unveiled three types of coffee drinkers:
- the drinkers that have a high sensitivity to caffeine. This group experiences a stimulatory effect even when they drink small doses of coffee as their metabolism is very slow. If they drink coffee in the evening they usually have trouble sleeping
- the coffee drinkers with a common sensitivity to caffeine. This groups can sip up to five cups of coffee every day and don’t have trouble sleeping or experience adverse effects. Researchers don’t recommend that this group drink the dark brew in the evening.
- the coffee drinkers that are not sensitive to caffeine or have a low sensitivity. Their liver can metabolize the compound lightning fast, so drinking coffee before sleep has no stimulatory effect on them.
These differences help explain why in a family a person cannot sleep after one cup of coffee in the evening while their partner has no trouble sleeping after consuming five cups.
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