Putting aside the problems of accurately figuring out diets, your charts show very little different consumption in total carbohydrates per day. In 1909-19 it sh

Putting aside the problems of accurately figuring out diets, your charts show very little different consumption in total carbohydrates per day. In 1909-19 it shows 487g carbs per day, and in 2004 is shows 481g carbs per day. The carbs in 1909 were often processed, but there was less sugar (potatoes are starch, and don't contain fructose). Sugar/sweets consumption increased from 12.9% of the diet in 1909-19 to 17.3% of the diet in 2004. Further, your chart shows that meat consumption went down (13.3% of diet in 1909-19 to 8.2% in 2004), whole milk consumption switched to lowfat milk and cheese, green vegetable consumption dropped, butter dropped (4.4% to 1%), lard & beef tallow consumption dropped (3.8% to 1.4%). These animal fats were replaced by salad and cooking oils (vegetable oils), going from 0.7% of the diet to 11.1% of the diet. Basically, while total carbohydrate and cholesterol consumption remained the same, Americans began eating more sugars and less starches and ate less animal fat and more vegetable fat.