my preop was strict and did not include any meals he put us on it for 2 weeks and said we woeld lose 1-2 pounds a day I ended up due to quick surgery date to only do 1 week and lost 9.5 pounds so deffinately possible if you stick with it. I am not an expert so wouldnt be able to tell about the 2 shakes 1 meal but mine is.
females 5 shakes/smoothies and male 6 a day.
the shakes are protein powder with water ff milk no sugar added apple juice and any other fruit juices. all fruit can be used. (watch what you add as it does add caleries) I made mine to be 8oz with half a banana and a few froen strawberies and a little water or applejuce.
also can be mixed with v8 and pureed vegetables (I hate v8 so never tried)
you can have all the no calorie drinks broth and s/f jello.
prety strict but did work for weight loss