there’s three main reasons.
damage to small blood vessels.
blood supply to toe or foot inadequate, and foot develop ulcers which become a entry point for germs.
damage to small nervous systems.
foot becomes numb, owner of foot doesn’t notice himself walking on glass and infection develops. foot becomes dry because glands shut down and skin becomes fragile.
damage to the immune system.
owner of foot easily gets fungal infections, small nicks get infected easily too. because the white blood cells that are supposed to deal with it are sluggish.
actually this topic alone is capable of being discussed for over an hour.
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