Doctor CKI Dinh Tran Ngoc Mai, Department of Nutrition - Dietetics, University of Medicine and Pharmacy Hospital, Ho Chi Minh City, answered: Coffee is a familiar drink, and many people often start the day with a cup of coffee to increase alertness.
Caffeine in coffee has a diuretic effect but it does not dehydrate the user if consumed in moderation.
Caffeine has many effects on the brain. It also has a diuretic effect on the kidneys when taken in high doses. Some studies have shown that caffeine has the strongest diuretic effect in people who have not previously consumed it regularly but suddenly drink a lot of coffee.
Although caffeine in coffee has a diuretic effect, it does not dehydrate the user if consumed in moderation. Studies show that for caffeine to have a significant diuretic effect, you need to consume more than 500 mg of caffeine per day - equivalent to drinking about 5 cups or 1.2 liters of filtered coffee.
In hot weather, the body needs to drink more water to compensate for the amount of water evaporated and sweat released from the body. Therefore, if you do not drink coffee regularly, you should only use a small amount of 1-2 cups per day, gradually increasing the amount and monitoring the body's signs to compensate for the loss of water.
To recognize dehydration, you can observe the color of your urine. The darker the urine color, the more dehydrated your body is.
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