For five decades, the consensus on heart disease was that fat was to totally blame, and sugar was nothing but an innocent bystander. Your doctor probably didn't prescribe two Snickers bars to deal with those chest pains, but it's not like they could hurt, right? Yes, they totally can, and researchers have known about it since the '50s.
So, how come we're only hearing about sugar's link to heart disease now? Well, the small fortune the sugar industry gave those researchers might have something to do with it.