“In my opinion, many people have been led astray by bad science. The tools used by scientific researchers in the past, and whose published papers have prompted changes in people’s diets, were not based on sound science. It was said that red meat and animal fats should be avoided, both because they are unhealthy and because ruminant animals (cows and sheep) are largely responsible for harmful methane emissions.”
But it turns out that neither of those positions are true.
https://www.farmdrop.com/blog/redefine-eat-healthy-sustainable-diet/