What on earth is caffeine? How much caffeine is there in a cup of coffee?
What exactly is caffeine?
Caffeine is a central nervous system stimulant that affects the brain, spinal cord, and metabolism, which is why it has a refreshing effect. Caffeine usually peaks in the blood within 1 hour of ingestion, and residual events occur 4-6 hours after ingestion, and are consumed in urine.
How much caffeine is in a cup of coffee
We often say a cup of coffee, but a cup is not an exact unit. Coffee cups come in different size, and the focus here is on the amount of coffee and caffeine.
For espresso, the Italian Espresso Association has a standard that a serving of espresso uses 7 grams of coffee. Caffeine levels vary from coffee variety to coffee variety, ranging from 1 percent to 3 percent. So it's possible that an espresso can contain anywhere from 70 milligrams to 210 milligrams of caffeine. Popular Arabica coffee is low in caffeine, typically 1 to 1.5 percent, so a serving should contain between 70 and 150 milligrams.
Coffee machines are common, and many coffee maker manufacturers do not provide information about caffeine, but automatic coffee machines must be designed to comply with the most widely accepted standards in the industry. So basically you can think of an automatic coffee machine Shot as using about 7 grams of coffee beans.
For manual coffee making, 7 to 10 grams or more is fine, plus a 1:16 water ratio. But many people don't want to be as precise as the Germans, so a common method is two spoonfuls of coffee, about 10 grams, plus more than three liang of water, which is enough to make a perfect handmade coffee.
Coffee intimate contact caffeine because of the stimulation of central nervous system and muscle function, so you can cheer up, enhance thinking ability, restore muscle fatigue. It acts on cardiovascular system, improves heart function, relaxes blood vessels and promotes blood circulation. For the gastrointestinal system, it helps digestion and helps break down fat.
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