The proportion of the American diet that was carbs has risen since the 60s, not decreased. In the 50s and before the average American ate a larger portion of th

The proportion of the American diet that was carbs has risen since the 60s, not decreased. In the 50s and before the average American ate a larger portion of their diet as fats, butter and oils were very common and heavily used in western diets before the anti fat craze.