What you're saying, that's the reality. When we are getting old, we gain fat.

We usually don't consider that we substantially reduce physical activities. If we sit all day for any reason such as work at office or having a desk job, suddenly we realize our clothes don't fit any more. Then we are just wondering what's happening. we don't keep our body moving as we used to do when we were young.

Thank you so much @annemariemay for showing the insights!