This is the problem with the whole "carbs are making us fat" narrative. Sugar consumption peaked in 1999. But consumption of chicken and cheese has gone through the roof since then. As you can see from the charts, the decades where people were supposedly loading up on carbs were also decades where meat consumption exploded.

https://www.ers.usda.gov/data-products/ag-and-food-statistic...

Americans are eating too much of everything, basically. A lot of the health benefits attributed to various diets are just the intrinsic benefits of losing weight.