Is that based on your weight, your doctor, or your insurance company?

Moving to the proper forum, will answer over there.

Is that based on your weight, your doctor, or your insurance company?

Your Doctor mostly & Weight - some don't require it - but it's suppose to shrink your fatty liver - if the liver is too fatty they have a harder time placing the band.

It's my understanding that if it is the few weeks prior to surgery it is surgeon requesting to shrink the liver. If it is the six month deal, thats the insurance company.

Is that based on your weight, your doctor, or your insurance company?

It depends on what you're referring to when you say "pre surgery diet". Most surgeons require you to follow a diet before surgery, lasting between 1 - 14 days, usually. This diet is the surgeon's requirement and based on what needs to happen for the easiest/safest surgery possible. It's not linked to anything else. The purpose of the diet is to purge sugar stores from the liver, decreasing its size, and allowing easier access to the area the surgeon will need to access.

Some insurance companies require pre-op diets for X time or that result in X loss. I believe the companies that require this require it across the board, so it's not really based on any body metric.

Some surgeons require pre-op diets. I've seen this happen two ways. One is of the patient is so obese that it compromises the surgeons' comfort level. I think the threshold for this is BMI of 60+. The surgeons may then require weightloss to a certain BMI as a qualifier for the surgery.

Some surgeons also like to see X percent of weightloss in patients before they will do the procedure, but most often it's an insurance requirement. Few surgeons are going to tell a sure-thing self pay that they have to complete a diet first.

Hope this helps.