Yuck!
My sister worked at MickyD's in HS and said that the secret ingredient that made them taste so good was sugar! I mean actual granulated sugar...they'd shake it on with the salt at the end. Oy! As if they don't have enough simple carbs all on their own???
I smell the food there sometimes and feel tempted...for a second. Then I remember what I saw and read in "Super Size Me" and "Don't Eat This Book!" and I can't even imagine it. Blech!!!
On the other hand, I've been known to have a sweet potato fry in a restaurant once in a while...and I'm sure they aren't low in fats...