Congrats on your progress. A friend of mine lost 150 lbs. on Wegovy, so there is definitely potential for tremendous success.
I hear you on the Costco stuff. I spent $60 there Sunday on protein (pork, chicken, Chomps, yogurt). I get all of my protein there and all of my fruits and veggies at Trader Joe's.
I too suffer from fat liver, but 1st stage. Just found out about three or four months ago. But instead of taking medicine for it, my doctor (DO) told me to make sure that I didn't drink alcohol (I used to drink about 2-3 ounces of dry wine with dinner each evening), and also to avoid consuming sugar, specially the sweeteners derived from corn. I probably lost weight perhaps a little over 20 pounds, and feel much better now. I probably had this condition for several years already since I had been borderline diabetic, but was unaware of it until recently. I have done it this way:
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No junk food of any kind (fries, chips, fried foods, and so on)
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No fatty foods, including beef, pork, bacon, sausages. But skinless chicken (breast pieces) without fat is OK if limited to small amounts.
No sugar of any kind, specially the ones derived from corn. Keep this in mind: some coffee creamers that are labeled as "sugarless" contain corn sweeteners, but nowhere in the list of ingredients these sweeteners are called sugar.
Corn sugar is one of the worsts carbs there is.
No nutritional bars (these two are loaded with sugar, including granola bars and such). No soda, specially the diet ones because of the chemical sweeteners they include. Also,
I not longer eat corn (corn contains a lot of sugar, and it also interferes with vitamin B3 absorption).
No juice of any kind, but sugarless beet juice may be OK. No processed foods of any kind, including white breads and flour. The only oils I consume are
extra virgin olive oil, and avocado oil to a lesser degree. Fruits are ok too, specially strawberry, cranberry, and raspberry, but limited amounts of apple and oranges.
I have been eating fish of various kinds, specially salmon, sardine, and limited portions of yellow albacore tuna (supposedly checked for traces of mercury before canned). Tilapia, and other fish, too. Lots of veggies of various colors, legumes (beans of different kinds and colors), green leafy salads, brown rice, wild rice. Broccoli is good, beet root, plain black coffee (no creamer, sugar, etc), green tea, a few drops of lemon juice in your drinking water (a few drops per glass). Plain oatmeal for breakfast (never instant oats). My oatmeal breakfast includes unsalted mixed nuts (CostCo has numerous kinds). If I ever eat yogurt it does not contain sugar or any kind.
Lean meats are ok, too: bison, moose, deer, elk.