Generally normal people drink more water will not be fat, but if you suffer from glomerulonephritis, nephrotic syndrome and other diseases, drink more water will cause edema, increase body weight, mistaken for gaining weight. Water is one of the important substances to maintain human life, under normal circumstances, the general health of the people, water drink more is not fat, water is no calories, will only promote metabolism and blood circulation, increase the number of urination. However, if one’s kidney function is poor, suffering from glomerulonephritis, nephrotic syndrome, diabetic nephropathy, uremia and other kidney diseases, drinking more water may be mistaken for gaining weight. The above mentioned diseases are in fact only impaired kidney function, which cannot timely convert water into urine to be excreted from the body, thus water retention in the body, edema and weight gain. Some patients may also have symptoms such as oliguria, hematuria and proteinuria. In summary, if you find yourself in the situation of drinking too much water and gaining weight, you should go to the hospital in time to improve the examination and clarify the specific causes.