https://www.hsph.harvard.edu/news/hsph-in-the-news/low-fat-d...
And in general, the American population has been following this diet, and we are fatter than ever before, suffering from Type 2 Diabetes. And the "science" behind our current health policy is driven by organizations like the American Soybean Asociation who are more concerned with making money and less on science. And when you start talking about money, the science research will follow the money, because the scientists need to eat.
Please take a look at this videos,
https://youtu.be/Q2UnOryQiIY https://youtu.be/7Lww5WH7INI
I would read her book before you pass judgment.