of course the patty isnt 100% meat - ever done cooking? you need stuff to make it stick together usually

Also any minced meat is usually the leftovers and crap off the floor unless you are paying for prime mince, which i cant see a large corperate doing for the sake of a few whingers (though in NZ they actually do use 100% NZ Beef apparently).
Sausages also are the same, in fact they cannot be considered sausages here unless it has over 50% meat, and a few dont so they get called 'sizzlers' and other wanky names.
Chicken nuggets are probably the worst, they appear to be entirely chicken fat, chicken skin, and god only knows what
But again, this is not a McDonalds thing, this is how they make our food. Ever looked at the ingrediants of a mince meat pie? Parts of noses, eats, livers, lungs, etc. Its not because they are out to get you, its just how they make the food, thats why its so cheap. Like cheese is just moldy cream/milk kinda thing.
But either way, this still has nothing to do with weight loss, which its all about anyway, and you can eat snails and tree bark if you want, so long as the calories in are less than the calories out