Caffeine is found in coffee, tea, soft drinks, and energy drinks, among other products. However, according to ScienceDaily, these beverages should not be considered equivalent.
Researchers explain that coffee contains many compounds in addition to caffeine.
As a result, it is difficult to determine whether the health benefits come from the caffeine itself or from the other substances found in coffee.
At the same time, much of the existing research is based on observational studies, which identify associations rather than proving a direct cause-and-effect relationship.
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Everyone responds differently
The amount of caffeine the body can tolerate varies from person to person. Age, genetics, medication, and metabolism can all influence how caffeine is processed.
Researchers also point out that sugar, syrup, milk, and cream may alter coffee's effects on health.
For this reason, they are calling for more research into how different caffeine-containing products affect the body.
The key conclusion
The new review, published in Circulation, shows that most adults can safely consume up to 400 milligrams of caffeine per day.
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That is equivalent to approximately three to five cups of black coffee without sugar or cream.
According to ScienceDaily, this level of consumption may be associated with a lower risk of heart disease, heart failure, stroke, and type 2 diabetes.
At the same time, the research shows that energy drinks and energy shots with high levels of caffeine may increase blood pressure and the risk of irregular heart rhythms.
The researchers therefore conclude that it is not only the amount of caffeine that matters, but also its source, when it comes to heart health.
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