Chocolate: Is it good or bad to us

Negatives

• large chocolate consumption can leads to migraines.
• cocoa or dark chocolate may produce certain effects on human health. In test tubes, cocoa has antioxidant activity, an effect not proved in the body. 
• can cause addiction  and acne 

Positives

• Chocolate May Make You Smarter?? Boost of blood flow to the brain created by cocoa's flavanols seems to make people feel more awake and alert.
• Chocolate Improves Vision. Because of chocolate's ability to improve blood flow, in particular to the brain, chocolate may also increase blood flow to the retina, thereby giving vision a boost.
• In a Swiss study a group of 20 smokers were given 40 grams of chocolate. Two hours after consuming the chocolate, the echo-graph showed that black chocolate, with a cocoa percent of at least 74%, significantly improved the blood flow. Additionally, ulterior tests showed that the risk of encountering blood accidents and blockages has been decreased to half of the initial risk. (good news for smokers???)