In the US, I'm convinced that it was the food pyramid.
As a kid in the 80s, I wondered how it made sense that my diabetic father was told to follow the same model as non-diabetics, which emphasized carbohydrates.
"Revealed: group shaping US nutrition receives millions from big food industry" -- The Guardian[1]
[1] - https://www.theguardian.com/science/2022/dec/09/academy-nutr...
"Revealed: group shaping US nutrition receives millions from big food industry" -- The Guardian[1]
[1] - https://www.theguardian.com/science/2022/dec/09/academy-nutr...