A) Science is never settled.
B) The dietary “advice” promoted by the government—high carb, low fat—is largely responsible for the obesity epidemic currently gripping the US. A high protein, low carb arrangement is vastly superior when it comes to losing/maintaining weight.
C) Sedentary work/lifestyles don’t help. Burning off more calories than you take in is essential.
“A) Science is never settled.”
This bears repeating in every thread of this sort, whether it’s about climate, health/medicine, physics, or whatever.