Sugar Makes You Stupid, But Omega-3s Will Smarten You Back Up (forbes.com)

...and coffee will kill you early, but make you live 5 years longer, and walking down the sidewalk increases your risk of sprained ankle by 20%.

There were quite a few rather disappointing Forbes articles on HN recently. For a more elaborate analysis about what's wrong with this one, check Ben Goldacre's "Bad Science".