Too much of consumption of water may lead to malfunction of brain. Just like a poison intoxication, drinking water continuously leads to water intoxication. It makes your bladder heavy and dilutes the sodium in the urine, which joins in the blood stream. Frequent urination due to excessively drinking water also reduces the effective functions of the kidney, where the bile salts are not removed. All these elements together contribute to create an imbalance in the brain. This is the reason that patients with kidney disease are not allowed to consume more water.