My wife recently came home from the hospital after her esophagectomy. Due to a complication with her J tube, she is already eating a wide range of foods, basically anything she wants. But she does get full, and she has some appetite, but not a lot of appetite, so we are concerned about her losing weight. She is already at the lowest weight that she would want to be at.
Could you say more about why you think you lost so much weight and have so much difficulty adding weight? That would be helpful. Thank you.

I found that Boost Very High Calorie Drink, in a blender with either whole milk, ice cream or full fat yogurt plus some frozen fruit make a palatable shake for my husband, and best of all- each shake has 600+ calories! It gets tiresome drinking your calories, but I give him 2 of these skakes per day (that's a lot of calories) plus make sure that every bite of food he eats has a lot of fat and calories to it. He is nowhere near his goal weight, but I'm hoping we're on the right track. This is definitely going to be a challenge going forward (Esophegectomy Jan 17, 2023)

Having the same issues and know what your going through. Still trying to find the solution for me. Everything my oncologist and surgeon have recommended and tests, studies have not shown anything. Not any positive results anyway. Hang in there I’m sure our solution is forthcoming.