To paraphrase Newton: "For every study finding, there is an equal and opposite other study finding."
I think too many academic studies can cause cancer. All that bleached paper running around. Lots of thinking, correlating data and so on. Makes my brain hurt just thinking about it.
(dark) chocolate is *always* good for you. As long as the first listed ingredient is chocolate and not sugar, it's a heck of a lot better than nothing (and more pleasant, too).