What is the health benefits of dark chocolate?

Q. What is the health benefits of dark chocolate?
A.
One-third of an ounce of chocolate — that's about two squares of a bar — can satisfy a craving without blowing your diet.
Source: http://www.msnbc.msn.com/id/16948960/

Dark Chocolate Has Health Benefits Not Seen in Other Varieties.
Source: http://www.webmd.com/diet/news/20030827/dark-chocolate-is-healthy-chocolate

Amazing Truth - Eat Chocolate and Lose Weight!
Source: http://ezinearticles.com/?Amazing-Truth-Eat-Chocolate-and-Lose-Weight!&id=2113974

Benefits of Dark chocolate (60% cocoa or more):
1.
- Lower high blood pressure for a certain age people.
- Antioxidants gobble up free radicals, destructive molecules that are implicated in heart disease and other ailments. Those volunteers who had dark chocolate had a 20 per cent increase in antioxidants in their plasma.
Source: http://www.stuffedchocolate.com/health_benefits.htm
2.
- Reduce sensitivity to pain.
- Promote relaxation.
- Trigger the brain's production of natural opiates.
Source: http://www.prohealth.com/library/showarticle.cfm?id=3464&t=CFIDS_FM
3.
- Harvard Researchers recently found that cocoa flavonoids (protective substances that are also abundant in dark chocolate), improve blood flow to the brain. Increased blood flow to the brain can help slow the mental decline that occurs with the aging process.
Source: http://www.curepure.com/diet/health-benefits-of-dark-chocolate
4.
- Redice blood clotting.
Source: https://www.health.harvard.edu/press_releases/The-health-benefits-of-that-heart-shaped-box-of-dark-chocolate