What factors affect caffeine levels? coffee and caffeine

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Coffee drinkers always care about the amount of caffeine they drink and whether they drink more than their normal daily intake. Even if you occasionally go to the convenience store to buy a cup of easy-to-open coffee, you have to haggle over the caffeine label and choose more or less coffee according to your need for pick-me-up.

According to teacher Han Huaizong in the New Edition of Coffee, caffeine can reach a lethal amount of about 10 grams, but each cup of espresso (espresso) contains only 70 to 100 milligrams, which means that you have to drink more than 100 cups of coffee to have a significant impact. However, no matter how we drink, we can't drink so much, but we should not drink too much, causing a burden on our bodies.

What is the source that affects the caffeine content of a cup of coffee? Mainly: variety, baking degree, cooking method and extraction time.

Varieties: Brazil grows so-called low-caffeine coffee, directly changing the genes of coffee trees to grow, and because of genetic differences, the Robusta variety has more caffeine than the Arabica variety. So friends who care about caffeine should pay attention if they travel to Italy. The more coffee beans go to the south, the more robusta will be mixed to increase the thickness of the flavor.

Roasting degree: if the brewing ratio is measured by coffee weight and water weight, under the same brewing ratio, the caffeine content of light-roasted coffee will be less than that of deep-roasting coffee, because the caffeine content will not decrease with baking time. however, the weight of each coffee bean is lighter, and the same proportion uses more coffee beans, so the caffeine content of deep-roasted coffee may be more! Some coffee shops (mainly espresso) sell light-roasted coffee as decaf.

Brewing method: a short time of brewing extraction, Italian concentration through the pressurized process, the amount of coffee extracted will be more than the same volume of hand-brewed or Saifeng coffee liquid, similarly, caffeine will be extracted into the coffee liquid content will be more.

Extraction time: usually ice droplets or ice-brewed coffee will allow water to extract coffee powder for a long time, and the amount of caffeine released over time will be much higher.

Instead of always thinking about how much coffee to drink and how much caffeine to drink, it's really complicated to calculate! Because chocolate, cola and tea also contain caffeine, in addition to counting the coffee, you should also consider these foods and drinks at the same time!