All patients who are qualified for this study will then be randomised by receiving their medication/introduction of dietary management using the standard simple randomization method.Group I patients will receive keto-/amino acid (Ketosteril) supplemented low protein diet during the active treatment period while Group II patients will receive non-supplemented low protein diet during the same period. The daily dose of keto-/amino acid for each Group I patient is one tablet every 5 kg body weight. The total daily dose will be divided into three times a day.