Sure. You're going to lose some muscle mass no matter what you do. And yeah, if you don't do either of those things, you're going to lose even more.

But fat people actually frequently have quite a bit of lean body mass - it takes muscle to carry around all that weight, even if you're sedentary. If I somehow maintained the LBM shown in my DEXA scan at the start of tirzepatide, by the time I got to my goal weight, I'd be looking more jacked than when I was lifting 3 times a week.

Obviously, I won't. I'm adding more and more cardio and lifting back in as my weight is dropping and it becomes more maintainable for my joints, etc., and I've been supplementing protein since the start, and I'm sure I'll still lose plenty. But I have the room to lose A LOT and still be in the healthy range of body fat%.