Prior to early 2000s when sugar consumption started going down, it was probably a reasonble guess as one of the drivers of increasing disease. But since then sugar consumption has tailed off while disease rates have continued to rise, so I don't think it's plausible anymore.
https://pmc.ncbi.nlm.nih.gov/articles/PMC7666899/
My bet to flatten the chronic disease curve would be reducing n6 fat consumption, especially from foods fried in vegetable oil.
Provactively, the steep upturn in diabetes rates around 1990 conincides with a broad movement in the fast-food industry to replace animal fats like tallow with vegetable oils.
https://archive.seattletimes.com/archive/19900724/1083993/ch...