While our ingestion of saturated fats has dropped 11% since the early 1970s, we eat at least 25% more carbohydrates—including 50% more grains. Teicholz explains:
Keys himself was likely instrumental in the U.S. Department of Agriculture's approval in 1980 because of his governmental connections. Teicholz notes he had quickly developed important alliances with the National Institutes of Health, politicians on Capitol Hill, and the USDA itself. Harvard professor Mark Hegsted successfully persuaded the U.S. Senate to recommend Keys' diet to the entire nation. In 1977 he said the question wasn't whether Americans should change their diet, but why not? He told the Senate no risks could be identified. In a nutshell, that's how bad science became bad federal policy for a half century.