It is popular in Japan to drink water immediately after waking up every morning. Furthermore, scientific tests have proven its value.
Apparently, for old and serious diseases, as well as modern illnesses, the water treatment had been found successful by a Japanese medical society as a 100% cure for the following diseases:
Headache, body ache, heart system, arthritis, fast heart beat, epilepsy, excess fatness, bronchitis asthma, TB, meningitis, kidney and urine diseases, vomiting, gastritis, diarrhea, piles, diabetes, constipation, all eye diseases, womb, cancer and menstrual disorders, ear nose and throat diseases.
Drinking too much water in too short a time overwhelms the kidneys and can cause a sudden drop in blood sodium levels. Sodium is one of the body's electrolytes (the others are potassium, chloride and bicarbonate). A drop in sodium leads to water entering the brain, causing it to swell. Results include lethargy, disorientation, confusion, seizures, coma and death."
"Rapid intake of too much water floods the inside of cells when sodium is depleted. This sodium depletion, called hyponatremia, can rupture the cells, either from extra pressure on the cells from without, or from pressure within flooded cells.
Generally speaking, we hit the danger zone when we take in more water than what our kidneys can process in a hour. And for someone with extremely healthy kidneys that is about 30 oz. of water in a hour (please don’t drink that much!). Drinking too much water in rapid succession can prove fatal and should definitely be avoided."