Comment by buu700

Agreed, this is a big part of the problem. The average person doesn't have anything resembling a coherent mental model of nutrition, and vague conflicting nutritional advice only adds to the confusion. The average person doesn't even know what a carb is, much less understand the biochemistry of how their body processes one.

Does "reduce fat consumption" mean a proportional reduction (i.e. increase carb/protein consumption) or an absolute reduction (i.e. decrease overall caloric intake)? In either case, what macros and level of caloric intake relative to TDEE are the assumed starting point? Who knows, but the net effect has been multiple generations hooked on absurd concentrations of sugar and UPFs.