When your weight is varying 1-3 pounds in a day... that is from water not fat, or a big load of poo that you have either expelled of are carrying around inside your intestines. Your evidence based on daily scale readings that you can gain far more weight from the same diet that skinny people eat is basically nonsense. You likely do have a slow metabolism from heredity and a sedentary lifestyle but there is no reason that with determination and better choices that you could not turn this around.
For those who are putting their lives at risk by remaining morbidly obese for years on end... there is always the option of bariatric surgery. I have not known one person who did not lose a massive amount of weight after they had a “lap band” installed. This includes those who claimed for years that they ate no more than skinny people. There is no doubt from the description of your situation that you are eligible for this procedure. With a lot of extra weight and a heart condition it could literally save your life, especially with the added risks that Covid has created in the last couple of years.
“Your evidence based on daily scale readings that you can gain far more weight from the same diet that skinny people eat is basically nonsense”
Nonsense? Would you like to see the daily weight records. I’ve got 6 years’ worth. But then it’s obvious that you know so much more than I do about my health issues. Have you ever been even 10 lbs. over your ideal weight? I could show you in the last week three days when I averaged 1.2 lbs. gains per day. Using your scenario, I would have had to have consumed 4200 extra calories per day on those three days or a total of 12600, to accomplish that. I probably don’t eat 12600 per week. And yes, I keep very exacting dietary records too. So, peddle your, you’re just lazy and overeat preaching somewhere else.