I've read hundreds of the best and biggest nutritional studies, and here's my quick and dirty what nutritional "science" has actually proven beyond doubt (mostly from country-country comparisons and massive epidemiological studies):
- --Trans fats are poison, there's no good amount.
- --Processed sugar is bad, there's no good amount.
- --Rapidly digested processed carbs are nearly as bad as sugar.
- --Red meat is either bad or neutral, but processed red meat is definitely bad -- avoid.
- --Complex carbs are ho-hum, don't overdo it.
- --Saturated fats are ho-hum, not bad but better replaced by good unsaturated fats.
- --Most unsaturated fats (especially in nuts/olives/fish) are great, eat as much as possible.
- --Fresh fruits/vegetables are great, eat as much and as many different types as possible.
The ideal diet as we currently know it from available evidence is essentially the Mediterranean diet, which is the only intervention that is consistently and clearly linked to longer and healthier lives. Note that an American-Vegan diet with adequate protein intake is closer to it that the typical fast-food, red-meat, fruit/vegetable-free, processed-sugar heavy disaster that most Americans consume.
My point is that I agree mostly with your summary, but it's not as simple as blaming carbs -- many countries that do better nutritionally eat more carbs than the US (though they're typically complex) -- and there's no reason to villainize vegans and worship bacon from a nutritional stand-point like so many in the geek culture do. Except to be instantly modded up to +5, that is.