Pre-Op Diet To Prepare Yourself?

So, since I started the pre-op program (3 months in my case), I have been trying to really limit myself on what I am eating, taking the nutritionist's advice on what to eat. Has anyone tried really limiting your caloric intake similar to what you would be limited to following surgery?

I understand that you would really struggle with an all liquid diet or a diet of only 400 or so calories without the help of the surgery, but I am looking to see if anyone tried, successfully to approach it in this manner? I think it would be a great way to ease into the new diet following and not be such a shock to your system or daily routine disruption.

I have been trying to stick with this philosophy and fortunately never had an eating disorder like binging or depressed eating. I am simply a case of being able to eat too much without feeling full, and eating all the wrong foods..... Initially in the beginning of this "experiment" the first week or two was tough becasue I had to fight all the cravings for sweets and carb heavy foods but now, 4 weeks or so from starting, it is MUCH easier. My cravings are gone, for the most part. The other day, I did have a craving for a PB and marshmallow fluff sandwich (sounds strange but tastes soooo good) so i made one....only to take a small bit and had it off to my wife who can afford to eat it! let me tell you how hard it was to have it in my hand and not eat it! But, I took a small bit of it and it completely satisified the craving and I no longer wanted it.

At this point, I eat 1 Protein bar for Breakfast, a handfull of raw almonds for a mid morning snack, a cup of chili for lunch, another handful of almonds for an afternoon snack, and then a zero fat, high protein yogurt for dinner. I fill the rest of the time with about 80-100 oz of Water and that's it....

Anyway, let me know your experience with the calorie limited, high protein, low carb attempt prior to surgery if you have been able to follow through with it and if it helped following surgery.