Calories. Fat was strategically demonized to take the heat off sugar. Keep in mind that in the world of calories fat is more than double the calories per gram of sugar (carbs). This give sugar the appearance of being healthy and half as fattening as fat. Why would they do this? Fat costs 10x more than carbs. Convince the population that carb calories are more food for less calories and even make the cals BOLD on the label. Then people will fill up on the cheap stuff instead of demanding value for their food dollars. Calories have convinced people to get less food for their money. A perfect scam. Nobody on r/fitness will accept this, but anyone who understand math and business knows I speak the truth.