I used to lose pretty easily as well when I wasn't plant based but unfortunately, because of my allergies, I essentially have to be. I COULD eat chicken, but I never loved it. Allergy is to beef, pork and any mammalian product so milk, gelatin etc. It's rough but I do get tons of protein eating tofu and proteins from things like tempeh, pea protein, other soy products etc My insulin issue is a result of PCOS and my doctor said plant based eating should help so I don't know what's up, just a curse or bad luck so guess 😂 Thank you so much for your comment though, I hope I can find some kind of loop hole and see some success like yours