i used to enjoy the shamrock shakes til they changed them a few years ago.
i also used to take up the only electric outset & tapped of their wifi a good bit back when i lived where i lived before where i live now. i started to drag a power strip with me in the same bag as my labtop so people could charge their phones & stuff. you would be surprised at how many people will give you a dollar as thx for letting them do that.
honestly, the place i was at was a mess. flies, crumbs & trash everywhere. the employs never came out from behind the corner except when customers pestered them to do so. the flies sometimes got so bad that i killed 5 of e'm with the back of my hand. it's a wonder they never got into the tea during those times when they forgot to put the lid on it...
i left a few dead flies on the window where everyone can see them & eventually arranged them to say "look its a mess to clean".
while many of their restaurants are relatively clean, there are quite a few scattered around that are not taken care of all that well.
next onto the topic of nutrition.
if your in the us, everything your eating has some kind of perseverative or chemical of some kind or another mixed in at some point the the existence of the meat or plant.
the only way to be free of that stuff is to grow the plants yourself, raise your own chickens & cows, and kill the thing you wish to eat yourself.
the only real difference between killing & eating a rabbit & eating a carrot is the rabbit is a lot more messier. whether your consuming the life of a plant or the life of an animal you still consuming the life of another living being to sustain your own. life begets life.
regardless, mc donalds can be a good way to trim your weight down in 6 months if done right, but it's not that great of thing to keep going for your entire life. one of the most healthiest things anyone can do is completely abstain from sugar like my grandma did. she was around for almost a century before the reaper took her away. though that didn't happened without one hell of a fight. death had been trying to claim her for about as long as i lived. in her 80s she was able to push a stove off of herself and just get up like it was nothing after her house broke apart around us.
regardless, your better off cooking your own food at home then eating fast food...