You need to feed, water and exercise it on a regular basis in order to keep it healthy and happy. It may not be able to speak in words, but it will tell you in other ways if you're doing something wrong (thankfully, pooping on the rug is not one of them).
Wouldn't it be interesting to start thinking of our bodies as our pets. How would that change what we feed ourselves? Would we be so excited for table scraps or would we opt for something a little more gourmet? Would getting outside and exercising be such a chore or would it become something we looked forward to?
Now, I'm not suggesting taking this thought process to extremes (no doggy treats for dessert) but maybe flip the switch and realize that our body, like our pet is our responsibility and as such our job is to take care of it to the best of our abilities. We wouldn't abuse our pets, so why would we abuse our bodies?
'The problem with loving is that pets don't last long enough and people last too long.'