The problem is that physical activity is unnatural and not intuitive. Biology is about saving energy, not spending it to keep everything healthy.
Bad mental health leads me to do less physical activity. Bad mental health also makes physical activity more difficult and painful.
Very wrong way to put it
All in all, it's not bad for something you almost get for "free".
But you can also choose to enjoy life, get fat (in moderation) and die a bit earlier. As far as I'm concerned that also a valid choice, depends on what you want from life...
physical activity is unnatural, because species are not expected to exercise for their health, since they already exercise naturally
I suppose exercise would cause me to naturally eat more long term to make up for lost energy, but perhaps only if my body can't make up that energy from sugar stores.
As for why eating doesn't make me hungry short term - I suppose exercising doesn't empty your stomach, which is what triggers hunger?
This is a ton of speculation.
it's pretty fun.
just gotta bring a change of clothes