Eating too much tannin teeth turned a yellowish white. Created more problems than it is added to cocoa content in chocolate is not very well understood. But the smell is essentially sugar. Eating chocolate bars, so it may cause tooth decay because the power of the sugar. Chocolate contains caffeine high. A substance that has effects similar to caffeine is Byzantium Tai O bromine (xanthine thiobromine), which has as many as 232 to 272 milligrams per 100 grams of chocolate, drinking a cup of hot chocolate or eating chocolate bars a medium. Or two pieces of chocolate biscuits. The body will be caffeine-like substance that is twice as much as a cup of coffee, chocolate contains oxalate (oxalate) in an amount not less. And these compounds may combine with calcium in the blood settling in the bladder. Cause kidney stones up