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Cocoa beans contain caffeine, so the higher the percentage of cocoa in a chocolate bar, the higher its caffeine content. Likewise for coffee: Ounce for ounce, the more diluted the coffee drink, the less caffeine.
Though the research team used cocoa powder for its experiments, the best way to take advantage of the health benefits of chocolate is to consume cacao, and preferably raw cacao. Many cocoa powders and chocolate products contain cocoa that has been treated with alkali, an agent that reduces its antioxidant potential. Many conventional chocolate products are also loaded with processed sugars and genetically modified (GM) soy lecithin, which can cause other health problems.