Yes, it seems true that you can die from eating too much chocolate.
We've all heard that you shouldn't feed dogs chocolate, that it makes them sick and can kill them. What I didn't know is that cats are even more sensative to chocolate than dogs are!
Here's the really wacky part that I just learned: it's not an issue with cats because they don't usually like chocolate --
they have no sweet receptors! Wacky, I tell you! Just plain wacky!
The problem for dogs and cats (and horses and some other animals) is an inability to metabolize theobromine, a major chemical component of chocolate. Even humans can die from eating too much, overwhelming the body's theobromine metabolism. But don't worry -- the amount for humans is about 22 pounds in one sitting.
Check out the Wikipedia page on
Theobromine poisoning for more information.