Im backing McD's here.

Eating just one thing all the time for a month is goint to be bad for you, regardless. Eating fatty/junk food for a month and screwing up your health, WOW big deal, exactly who was unaware of this?

We'd be pretty sick if we lived on a diet of just bread and water too. Speaking of water, too much consumption can KILL you too.

Think im going to pop out for a fillet meal now