Our plan is way different (Kaiser NorCal). They are anti-shake. So, we continue to follow the 1200 pre-op diet we've been on since starting the program, up until 6pm the night before surgery. Now, even though they are anti-shake, I admit, I have about 1 a day, since I am always busy around lunch time and forget to eat. The best tasting shakes I've found are the Premier Protein Shakes at Costco/Sams. The chocolate ones are like drinking chocolate pudding (not as thick, but the taste is similar.) They have 160 calories each, but a whopping 30 grams of protein and 1 gram of sugar.