Sugar was being consumed just a heavily before the war. It only became a demonized, food shaming tool because of rationing propaganda that warned (read lied to) mothers of the dangers of too much sugar. Thus the fictitious "sugar high" was invented and seized upon by nutrition "experts" to build a massive industry that depends on playing the blame game on so called bad foods that get reshuffled each decade or so. Everyone is suckered into blaming their food rather than their behavior and the people making billions off of this scheme aren't about to reveal the truth.