(1) Brain Function/Energy Level: Does water intake affects energy level and brain function?, There are multiple claims/postulation that if you don't stay hydrated throughout the day, your energy level and brain function starts to suffer. Several studies have proven this claim to be true, as a particular study carried out on Women, proved that a fluid loss of 1.36% after exercise affects mood and concentration, and as such increases the frequency of headache. In addition, further studies showed that a mild dehydration caused by exercise or heat can harm/affect many other aspect of the brain function, which ultimately can negatively affect physical performance, leading to reduced endurance. In summary, mild dehydration caused by exercise or heat can have negative effects on both your physical and mental performance, hence the need for constant water intake.
(2) Weight Loss: Does taking alot of water help reduce weight you may ask, the truth is that there are several claims that increased water intake may reduce body weight by increasing metabolism and reducing your appetite. A study proved that by drinking 500ml of water, one can temporally boost metabolism by 24-30%. Drinking water before meals (about half hour), can help reduce the number of calories one end up consuming. It's important to note also that drinking sufficient amount of water, particularly before meals, may have a significant weight benefit, especially when combined with healthy diet.
(3) Preventing Health Complications: Taking adequate water helps resolve several health Complications. For example, increasing water intake, can help with constipation, a very common health problem. Also, studies had shown that those who drink enough water, have a reduced risk of bladder and colorectal cancer. Increase water intake can also reduce the risk of Kidney stones.
In conclusion, it's important to note that most people don't need to consciously think about their water intake, as the thirst mechanism in the brain is very effective. Consequently, as a matter of fact, no one can tell exactly how much water you need, as it depends on the individual. Hence, when you are thirsty, drink water, stop when you are not thirsty anymore, and during and after heat and exercise, endeavor to drink enough water to compensate for lost fluid.
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