Source: New York Times
“The guidelines are based on papers that presumably say there is evidence for what they say, and there isn’t,” said Dr. Dennis Bier, director of the Children’s Nutrition Research Center at Baylor College of Medicine in Houston and past editor of the American Journal of Clinical Nutrition.
It is one thing for an individual to believe eating less red meat and processed meat will improve health, but “if you want to say the evidence shows that eating red meat or processed meats has these effects, that’s more objective" ... "the evidence does not support it.” said, David Allison, dean of the Indiana University School of Public Health—Bloomington
Beef in particular tends to have an outsized climate footprint, partly because of all the land needed to raise cattle and grow feed, and partly because cows belch up methane, a potent greenhouse gas.
Researchers have estimated that, on average, beef has about five times the climate impact of chicken or pork, per gram of protein. Plant-based foods tend to have an even smaller impact.