But since dark chocolate is not exactly a staple, what this is actually selecting for is "people who eat a variety of foods in big quantities" vs those who "gai

But since dark chocolate is not exactly a staple, what this is actually selecting for is "people who eat a variety of foods in big quantities" vs those who "gained all their weight from frozen pizza". It seems a no-brainer that the former is the relatively healthier choice. But that's not science. Science apparently is picking one variable at a time, blanking the rest of you mind, and drawing a conclusion.