HFCS consumption is still higher than it was in 1970, but it has declined since 2000, and its decline has driven the overall decline in sugar consumption, yet obesity and diabetes incidence have only increased.
> some cases T2D can be reversed by minimizing sugars/carbs and increasing fats so your mitochondria is primarily using ketones rather than glucose.
"Reversed" means you can eat carbohydrates normally again. If anything, high-fat, low-carb diets seem to worsen actual insulin sensitivity, which carbohydrate restriction just masks (even then, not always, as many on keto find when they check their BG): https://pmc.ncbi.nlm.nih.gov/articles/PMC5291812/
Severely restricting carbohydrate enough to get an artificially low HbA1c or fasting BG and claiming you "reversed" diabetes is like claiming you "reversed" your lactose intolerance by never drinking milk. But actual weight-loss (however you achieve it) does improve real insulin sensitivity, but low-carb isn't magic when it comes to that either.