One of the causes for dehydration is diuretic, which is found in caffeine. A diuretic is any substance that can cause an individual to urinate, including water. A great example is water pills, which people take to force urination and treat high blood pressure. Caffeine falls into the category of diuretic, but at high volumes of consumption. According to PubMed.gov, an individual deprived of caffeine for a period of time has to consume 2-3 cups of coffee or 5 – 8 cups of tea (250 – 300 mg) before the urine output starts to increase. This means if your body is used to consuming caffeine on a daily basis, you will not be constantly urinating.
According to Dr. Grandjean, “You see, the body develops a tolerance to caffeine after about three to five days of regular use – which greatly diminishes the weak diuretic effect of caffeine.” Even if you have 2 cups of coffee, your visits to the bathroom won’t change much. This proves that the possibility of dehydration from caffeine, alone is almost impossible. There normally has to be extreme measures to activate this type of problem. So if you take a long break from consuming caffeinated beverages, it is possible to see a change in urine output once you go back to consuming caffeinated beverages.
Since an excessive amount of caffeine is required to cause an abnormal amount of bathroom visits, it falls under the category of “anything being consumed in excess is harmful”. In reality, it is possible to consume too much water! This instantly displays how anything consumed needs to be done in moderation. Of course, consuming water versus a caffeinated beverage is healthier. At the same time, there is no harm in consuming more than one serving of a beverage just because it contains caffeine.