A small and preliminary study was hyped to claim that chocolate fights Alzheimer’s.

Have you heard? Dark chocolate will do everything from boost your cognition to reduce your cardiovascular disease risk and even help you lose weight! Or so the chocolate science hype machine will tell you.

Several months ago, we got to wondering how chocolate candy had earned such a powerful health halo. So we dove into the science behind these claims about chocolate and cocoa to find out more.

In an original Vox analysis, we discovered that food companies like Nestlé, Mars, Barry Callebaut, and Hershey’s — among the world’s biggest producers of chocolate — have poured millions of dollars into scientific studies and research grants that support cocoa science. Of the 100 Mars-sponsored studies on cocoa, chocolate, and health, 98 had conclusions that were favorable to the candy maker in some way.

That’s an uncannily high number. And it raises questions about the quality of the studies, given that Mars and other chocolate makers can use the positive findings to market their products. Industry-sponsored studies are more likely than independent research to yield conclusions that favor the funder’s products.

 Javier Zarracina/Vox

In our review of the research, we found studies that were well-designed, well-executed, and that produced seemingly reliable results. (This was particularly true for the science on cocoa’s effects on blood pressure.) But some of the other claims don’t stand up as well when you look closely at the evidence.

One study in particular about cocoa staving off cognitive decline jumped out at us because it had sparked a small fracas on PubMed Commons, a site where researchers can comment on published studies. Several researchers took the time to critique everything from Read More Here