I’m interested to hear of different post op diet requirements. Bypass

plans can be pretty different depending on your surgeon. Most seem to require at least 60 grams of protein per day. Many are also ultra-low carb, but not all. My plan was pretty balanced. Some are told to focus on getting their protein in first, then non-starchy vegetables - and then the more balanced plans allow a small serving of a "good" carb like fruit or something whole grain if you have room after you've eaten your protein and vegetables.

although few plans dictate how many calories you can eat (and it's hard to get many in the first few weeks ANYWAY), a lot of people seem to eat in the 600-900-ish range for the first several months (i.e., once they can start eating solid foods again - the first month or so you're largely on liquids, and then purees)

sorry this is kind of a vague answer, but plans can really vary.

They do vary a lot by surgeon, but they don't seem to change much between a sleeve or a bypass.

My surgeon's plan was very restrictive at the beginning - no fluids by mouth except ice chips until they did a leak check about 38 hours after surgery. Then I was on clear fluids for a week, and full fluids for another week. In contrast, other people say they were offered fluids right after surgery, were on full fluids when released, and moved to purees after only a week.

On the other hand, my surgeon's plan had me on normal food after a month with no long term restrictions other than carbonated soda (which they ban forever). Other plans may take 2-3 months to get you to mostly normal food, and tell you to wait even longer for certain things, like 3-6 months for raw veggies or 1 year for caffeine.

Here's a representative diet plan with a really detailed list of foods for each stage.
https://www.tuftsmedicalcenter.org/~/media/Brochures/TuftsMC/Patient Care Services/Departments and Services/Weight and Wellness Center/GBP Diet Manual12611.ashx

Water and shakes for me from the 2nd day in hospital and liquid diet for the first month with my RNY.