"The 1961 AHA advice to limit saturated fat is arguably the single-most influential nutrition policy ever published, as it came to be adopted first by the U.S. government, as official policy for all Americans, in 1980, and then by governments around the world as well as the World Health Organization," the article reads.
However, they were paid off to distribute this information. The AHA accepted $20 million (in today's dollars) in funding from Procter & Gamble, a corporation that conveniently makes and sells Crisco Oil. The AHA recommended that everyone replace butter with "heart healthy" alternatives like vegetable oil or Crisco Oil.
It wasn't until the late 2000s that scientists and journalists started to re-examine saturated fats and restructure the way people talked about butter, meat, and eggs in relation to overall health and wellness. Teicholz points out that the 2020 Dietary Guidelines expert committee "found that 88% of studies in their own review did not support" the idea that heart disease was caused by saturated fat. And yet the committee ignored this data and claimed "the evidence against saturated fat was 'strong.'"