What's the Maximum Amount of Coffee You Can Drink Per Day? Is 10g of Black Coffee Too Much?

It's past three o'clock, time for coffee. Work? Work can wait. Coffee first. No matter how much money you earn, you can't take it with you.

The Struggle with Fatigue

When it comes to fatigue, spring drowsiness, summer tiredness, autumn exhaustion, and winter hibernation all sound familiar. But when are people not tired? In the end it comes down to staying up late with our phones, thinking "just one more episode, one more game," while during the day the first thought on waking is how to take a day off.

Today's working people, how could they give up so easily? What problem can't be solved by a cup of coffee? And if there is one, then two cups.

Coffee Choices and Concerns

Going downstairs to find a coffee shop is hot and time-consuming, and delivery fees add up. Drip bags? Not as quick as freeze-dried coffee or cold brew. When people with decision paralysis finally decide what to drink, another question surfaces: I've had so much coffee, will I have trouble sleeping tonight? What is the maximum I can drink in a day?

How Caffeine Works

Everyone knows coffee keeps you awake because of the caffeine in it. After caffeine is absorbed, it peaks within 30 to 60 minutes. It usually takes 3 to 5 hours for the body to metabolize half of the caffeine, and the remainder stays in the body longer. Because caffeine is metabolized by the liver, someone with poor liver function will clear it more slowly, with the unit potentially shifting from hours to days.

So why do people feel tired? Because there are two little players in the human brain: adenosine and adenosine receptors. As adenosine binds with adenosine receptors, fatigue signals are transmitted to the brain, and after receiving those signals, people feel tired.

Caffeine's Effect on the Brain

Reading this, you should understand how caffeine keeps all you working people alert. Caffeine plays the role of a third party in this relationship, interfering with the pairing of adenosine and adenosine receptors. When caffeine enters the body, this "third party" kicks out adenosine, the "original partner," and domineeringly occupies the adenosine receptors. When the receptors lead the original partner to the brain, the instruction is to rest; when this "scumbag" receptor leads caffeine, the third party, to the brain, the instruction is to keep working.

When caffeine binds with adenosine receptors, neuron firing in the brain increases. The pituitary gland senses that something is off and stimulates the adrenal glands, producing adrenaline, which reduces fatigue.

Building Caffeine Tolerance

When you first start drinking coffee, you may feel very alert and worry about not sleeping at night. But as you drink coffee regularly every day, you begin to develop tolerance to caffeine. When adenosine receptors are occupied by caffeine for long periods, the body produces more adenosine receptors. Only then can adenosine bind with the extra receptors to transmit the signal that rest is needed.

So when a working person with a coffee habit wants to stay alert, the usual amount is no longer enough. Does that mean this person is immune to caffeine and can drink any amount without problems?

Of course not. An organization called the FDA points out that for a healthy adult, a daily intake of 400mg of caffeine is acceptable. That is not absolute, however. Because metabolic rates differ among individuals, each person's tolerable intake varies. When you find yourself starting to feel anxious, experiencing a rapid heartbeat, gastrointestinal discomfort, headaches, or nausea, that means you have consumed too much caffeine.

There is also no shortage of cases worldwide where excessive caffeine intake has led to death, such as a 19-year-old who died after consuming energy supplements equivalent to 4800 milligrams of caffeine.

Caffeine Content in Coffee

So how much caffeine is in that latte in your hand? It is actually equivalent to the caffeine content of one shot of espresso. According to the approximate reference values in the table below, drinking 3-4 cups of coffee per day is acceptable.

This table data is estimated from information in the United States Department of Agriculture National Nutrient Database and manufacturer-provided information, and does not refer to any specific coffee bean variety or coffee brand.

Since the amount of coffee grounds and the extraction rate differ from cup to cup, the caffeine content of each cup may also vary. The specific calculation formula is as follows:

Weight of coffee grounds used × Extraction rate × Caffeine content of coffee beans (Arabica caffeine content is approximately 1.2%)

Final Thoughts

In conclusion, relying on caffeine to sustain life seems to be a way of overdrawing your body. It is still important to go to bed early and wake up early to protect your health. As for coffee, isn't it nice to have one or two small cups normally, just like tasting wine?

It's break time, time for coffee. While drinking, don't overindulge.

Image source: Internet

FrontStreet Coffee Recommendation

If you are keeping an eye on your daily caffeine intake, cold brew is a gentle, low-acid way to enjoy coffee in moderation, and FrontStreet offers beans blended specifically for it. FrontStreet's Strawberry Candy Geisha blend pairs Panama Geisha with a Costa Rican honey-process coffee for rose, orange, grape, raisin, and strawberry-candy sweetness. For floral iced coffee, FrontStreet's sun-dried Huakui from Ethiopia brings magnolia, creamy strawberry, dried mango, guava, and black tea notes.