噢， 前一天差不多， 就是这前三天，前两天能吃什么 不能吃什么的说的不清楚。您这个完全不吃东西增加到两天是只喝白水？

前一天：

No solid food from now until your procedure is done. Begin a clear liquid diet (below). Drink at least 8 glasses of water or clear liquids during the day to avoid dehydration。