The health benefits of chocolate may include:

- Reduction of blood pressure by eating 6 grams of dark chocolate per day. Probably due to the flavonol epicatechin
- Reduction of platelet and endothelial cell activation
- Reduction of inflammatory mediators
- It can also inhibit oral caries
- It can cross the blood brain barrier and increase cerebral blood flow in humans

From Writer's Almanac:

Ode to Chocolate by Barbara Crooker (excerpt)

I hate milk chocolate, don't want clouds
of cream diluting the dark night sky,
don't want pralines or raisins, rubble
in this smooth plateau. I like my coffee
black, my beer from Germany, wine
from Burgundy, the darker, the better.

References:
The Essence of Chocolate. Dr Shock MD PhD, 2010.