Longer than that. In the 80s and 90s low-fat high-carb diets were pushed. The "food pyramid" I was taught in school was 5-12 servings of carbs per day. It was all based on bad science. It was very similar to mask "science" now where the data wouldn't match the conclusion but the conclusion would support the government position anyway.
It got worse over time. By the 80's and 90's there were still some areas that did legitimate research, but by the early 2000's it was all just trash. Just look at the different response to swine flu compared to covid. It was literally a trial run.
Longer than that. In the 80s and 90s low-fat high-carb diets were pushed. The "food pyramid" I was taught in school was 5-12 servings of carbs per day. It was all based on bad science. It was very similar to mask "science" now where the data wouldn't match the conclusion but the conclusion would support the government position anyway.
It got worse over time. By the 80's and 90's there were still some areas that did legitimate research, but by the early 2000's it was all just trash. Just look at the different response to swine flu compared to covid. It was literally a trial run.