I am in USA and started my pre op diet today. Surgery date is 7/17. I have a pre op diet of up to 800 Calories. Most is consisting of protein shakes, protein water, bouillions, an occasional very low fat, low sugar yougurt. (High protein so Greek). I was wondering why someone had a 300 calorie a day post op diet. Wouldn't you not have enough protein? Saffy1, what is on your diet?