Caffeine content varies depending on the type of coffee and the degree of roasting
When most people think of coffee, "caffeine" probably comes to mind.
How much caffeine is in the coffee we drink, and is the amount of caffeine different between shallow-roasted and deep-roasted coffee? I am sure everyone has many questions about caffeine.
We would like to help you understand the relationship between coffee and caffeine.
Coffee Types and Caffeine
Arabica and Robusta are the most widely distributed types of coffee. Most Arabica coffee beans are traded as "specialty coffee," which is a high quality coffee bean. Robusta is more resistant to pests and is often used in canned coffee and instant coffee.
The caffeine content of Arabica coffee is about 1%, while that of Robusta coffee is about 2%, about twice as much.
Let us look at the caffeine content of canned and instant coffee, in which Robusta is often used.
Instant coffee: 57mg/100ml
・Canned coffee: 90-160mg/can
Although Arabica and Robusta varieties were not specified in these figures, canned coffee has a large range in caffeine content, probably due to the large variety of canned coffee.
If you want to choose a coffee with reliably low caffeine, we recommend choosing decaf (decaffeinated) coffee. Also, the Laurina variety of Arabica has half the caffeine content of other Arabicas.
Differences in caffeine content between shallow-roasted and deep-roasted coffees
Caffeine decreases as roasting progresses. Therefore, deep roasted coffee has less caffeine than shallow roasted coffee. However, the deeper the roast, the more its volume increases and its weight decreases. Let's take an example to illustrate what this means.
If you measure coffee beans with a measuring spoon (by volume)
The amount of caffeine is shallow roasted > deep roasted.
When using a scale (weight)
Deep roasted coffee is lighter and requires more grains. Therefore, the amount of caffeine is shallow roasted ≒ deep roasted.
You may have the impression that the more bitter and dark the coffee tastes, the more caffeine it contains, but in fact, there is not that much difference in the amount of caffeine depending on the degree of roasting.
Effects of caffeine on the human body
Caffeine is known to dilate blood vessels and increase blood circulation, which leads to diuretic effects, increased neurotransmitters, elevated mood, loss of sleepiness, increased basal metabolism due to sympathetic stimulation, and increased stomach acid secretion.
Although there is no specific limit to the amount of caffeine that can be consumed, it is known to cause increased heart rate, excitement, anxiety, and tremors, and that pregnant women should refrain from consuming caffeine.
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