system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is walking in bad/old shoes considered unhealthy, but walking barefoot isn't?
gpt
Shoes wear unevenly and because of this puts unnatural pressures on your foot affecting your entire posture which can damage muscles and other connective tissues all the way up into your shoulders and neck.

Walking barefoot only puts bad/unnatural pressures on your musculoskeletal system if you have a deformation like flat foot.