McCrap's give you transfat and unhealthy crap dressed up as
'food'
in the US, they found more faecal matter in the burger patties than
in a toilet...
the 'chicken' nuggets/patties are about 54% fat, mostly
transfat
the 'fish' is about 45% fat, mostly transfat too..
the oil they cook their fries in is 100% transfat...
they used to coat their buns with some sugar so that your senses
are tricked into wanting to eat more (not sure about now) as the
trace smell of caramelising sugar makes your mouth water and kicks
in your appetite..
they add a lot of salt because their research taught them about
genetic programming in us to want to eat more salt because it is
hard to find in nature and it is vital for life...
and most of all, the stuff doesn't taste anywhere as good as roast
duck or stuff like that you get in proper food 
you want me to go on? 