Chocoholics may unite in celebration, for the news is good: dark chocolate possesses the highest antioxidant content of any food. Chocolates contain iron, magnesium, phosphorus, potassium, and, in milk chocolate, calcium. But it is the antioxidants and the flavonoids which boost good HDL cholesterol levels that has us dancing in pagan delight. The flavonoids in chocolate work in a similar manner to a very low dose of aspirin to prevent blood platelets from clumping together to form a blood clot.

Chocoholics may unite in celebration, for the news is good: dark chocolate possesses the highest antioxidant content of any food. Chocolates contain iron, magnesium, phosphorus, potassium, and, in milk chocolate, calcium. But it is the antioxidants and the flavonoids which boost good HDL cholesterol levels that has us dancing in pagan delight. The flavonoids in chocolate work in a similar manner to a very low dose of aspirin to prevent blood platelets from clumping together to form a blood clot.
http://www.slashfood.com/2007/07/28/happy-national-milk-chocolate-day/