Everyone needs to drink 8(8 ounce) of water every day.

Fact - It’s just not true. There is no science behind it. There isn’t a set amount of water all humans need to drink. Each person’s water needs differ, depending on their health, size, diet, general sweatiness, and a collection of other variables that don’t tidily add up to eight glasses of water per day. Water is healthy. Sugared drinks like pop and sweetened teas are not. Juice, especially dark colored juices like mango and berry juices, are healthy in small (one glass a day) amounts. Coffee and tea, in moderation, are also sources of fluid. Research has shown that coffee does not cause dehydration. There are also plenty of places to get water besides hitting the stuff straight-up. Alcohol and caffeinated beverages do contribute to your daily water intake. And yet every summer we are inundated with news media reports warning that dehydration is dangerous and also ubiquitous. These reports work up a fear that otherwise healthy adults and children are walking around dehydrated, even that dehydration has reached epidemic proportions. Let’s put these claims under scrutiny. Many people believe that the source of this myth was a 1945 Food and Nutrition Board recommendation that said people need about 2.5 liters of water a day. But they ignored the sentence that followed closely behind. It read, “Most of this quantity is contained in prepared foods.” Water is present in fruits and vegetables. It’s in juice, it’s in beer, it’s even in tea and coffee. Before anyone tells me that coffee is going to dehydrate you, research shows that’s not true either. Although I believe water as the best beverage to consume, it’s certainly not your only source of hydration. You don’t have to consume all the water you need through drinks. You also don’t need to worry so much about never feeling thirsty. The human body is finely tuned to signal you to drink long before you are actually dehydrated. Contrary to many stories you may hear, there’s no real scientific proof that, for otherwise healthy people, drinking extra water has any health benefits. For instance, reviews have failed to find that there’s any evidence that drinking more water keeps skin hydrated and makes it look healthier or wrinkle-free. It is true that some retrospective cohort studies have found increased water to be associated with better outcomes, but these are subject to the usual epidemiologic problems, such as an inability to prove causation.

You need to be drinking enough water to stay optimally hydrated. Generally speaking, that means replacing the water you lose through breath, sweat, urine and faeces.

Drinking enough water may offer health benefits, including:

  • Weight loss: Drinking enough water may help you burn more calories, reducing appetite if consumed before a meal and lowering the risk of long-term weight gain.
  • Better physical performance: Modest dehydration may impair physical performance. Losing only 2% of your body's water content during exercise may increase fatigue and reduce motivation.
  • Reduced severity of headaches: For those prone to headaches, drinking additional water may reduce the intensity and duration of episodes. In dehydrated individuals, water may help relieve headache symptoms.
  • Constipation relief and prevention: In people who are dehydrated, drinking enough water may help prevent and relieve constipation.
  • Decreased risk of kidney stones: Although more research is needed, there is some evidence that increasing water consumption may help prevent recurrence in people with a tendency to form kidney stones.

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