Is it true that “coffee draws out 1.5 times more water from the body”?

Coffee is known to have a diuretic effect. Because it causes the body to excrete more water than it consumes, some argue that excessive consumption can lead to dehydration. Is this true? Let's examine the research findings.

 

Here's how the caffeine in coffee induces diuresis: Caffeine binds to adenosine receptors in place of adenosine. This dilates the blood vessels in the kidneys, promoting sodium and water excretion and ultimately increasing urine output. Caffeine also inhibits the action of the antidiuretic hormone vasopressin, further increasing urine output. It also stimulates the bladder detrusor muscles, causing the urge to go to the bathroom even when there's no urine left.

 

However, the amount of water lost due to caffeine is not enough to cause dehydration. Some research has shown that coffee consumption does not increase water excretion. In 2014, a research team at the University of Birmingham in the UK conducted a study in which 50 men were divided into two groups: one group consumed four cups of coffee containing 4mg of caffeine per kilogram of body weight daily for three days, and the other group consumed only water. The results showed no difference in body water content between the two groups. No significant differences were found in hematological indicators, 24-hour urine output, or creatinine levels. However, the sodium content in urine was higher in the coffee group than in the water group.

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Some research suggests that consuming caffeine before or after exercise is safe. In a 2014 study published in the Journal of the American Academy of Sports Medicine (SAJSM), researchers divided eight healthy college students into four groups: those who consumed both caffeine and water, those who consumed only caffeine, those who consumed only water, and those who consumed neither. They then measured their physical changes before and after exercise. The results showed that consuming around 460 mg of caffeine had no effect on post-exercise urine output or body fluid levels.

 

So what about people with sensitive bladders? A 2011 study published in the journal Urology Annals found that people with overactive bladders didn't experience any significant problems when consuming low doses of caffeine. However, consuming more than 4.5 mg of caffeine per kilogram of body weight stimulated the bladder nerves and increased blood flow to the kidneys, resulting in increased urine output. In other words, a 60 kg man with a sensitive bladder could experience increased urine output if he drank two cups of Americano. An Americano, which contains two shots of espresso, contains about 150 mg of caffeine.

 

The recommended daily intake of caffeine for adults in South Korea is less than 400 mg. As long as you adhere to the recommended amount, the diuretic effect won't cause any health problems, so there's no need to worry too much. However, adolescents and children should be cautious, as the central nervous system stimulation can cause problems like decreased concentration.

 

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Coffee contains 1.5 times the amount of water in the body.

This comes out more than I thought.

 

So, after drinking coffee, you should drink twice as much water.

I guess that's the reason

 

If you drink coffee, your daily water intake will be

Should I consume more?