Does anyone know how long a pre-op liquid diet TLC's "Big Medicine" doctors require?

I think they're being deliberately evasive about it (what the younger doctor acknowledged last night as the "torture" of a liquid diet doesn't mesh well with such gauzy pleasant images as the glamorous plastic-surgery post-ops they trot out every week), but it seems to me that in one episode they said, or implied, that a liquid diet lasting several MONTHS might be required of a patient several hundred pounds overweight. I know that many surgeons require weight loss before the surgery, but several months without solid food? Has anyone heard of these, or any other surgeons, imposing this draconian requirement?

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