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I think most Americans do not understand what is a healthy food and would think of a "balanced" meal of carbs, protein and fat, with fat being bad circa the 1960s line of thinking.

"I think most people know what’s considered healthy food. They maybe wouldn’t be able to perfectly break down ideal ratios of macronutrients, but they have a rough idea. The average person whose bad diet is making them unhealthy would probably be able to point to the bad diet as part of the problem. If I walked up to the average person and asked them to make an ideal meal plan for themselves to be maximally healthy, I think most people would do a decent job."

This is why most of america is stuck in diabetes land. I bet you most americans couldn't tell you the difference between if something is high in carbohydrates or fat.