Food science is ever evolving. Things that used to be labeled detrimental for your diet, such as salt, are now shown to be crucial for optimal health.
These foods are actually ancient: Unrefined salt contain essential minerals; eggs boost our good -HDL- cholesterol; dark chocolate is full of flavonoids; coffee is loaded with antioxidants; and coconut oil lowers bad -LDL- cholesterol and contains highly beneficial lauric acid.
These seven food items have gone from being considered healthy (long ago) to unhealthy (within the last generation or two) to healthy again, even essential.
(READ the article in Salon.com)