Even if there's no fertilizer or dog shit on there, grass clippings are like razor blades and will fuck up your teeth, mouth, throat, guts and probably your anus on the way out. There are poisons in there and it'll cause you to leach out nutrients like calcium if I recall correctly. Not to mention, we can't digest glucose.
We weren't meant to graze, Johnny boy. We were meant to eat heme-iron based foods like delicious, nutritious meaaaats. Hope this helps.