Bjoern and I came up with some reasons why it's not a good idea to have a piece of chocolate every afternoon.

1) Familiarity breeds contempt.
What was once a treat, now becomes commonplace

2) Unplanned/Unwanted increase in body surface area.
Over the lips and through the gums, look out hips (thighs, buttocks, belly, etc.), here it comes!

But since we could only come up with 2, we've decided to go get some anyway.