standpoint, I don’t think there’s much question that dietary fats do not translate into higher blood lipid levels. But there is a caveat:
If I get half my calories from carbohydrates and half from non-carbohydrates, that is the worst of all possible worlds, unless my diet is very restricted in terms of calories. The meat is very calorically dense. But because of the carbohydrates, I get none of the metabolic benefit of eating mainly non-carbohydrates. Insulin levels rise and those calories are therefore put into fat, often starving other cells and leading to increased hunger. And the more fat cells you have to fill up, the hungrier you will get. So the fatter you are, the hungrier you get. Carbohydrates make those fat cells yell, “Feed me, Seymour!” As Gary Taubes has said, you are not getting fat because you’re hungry, you’re getting hungry because you’re fat.
1000 calories of bread will leave you far hungrier in an hour than 500 calories of meat. Why do you think that the joke is that if you eat American-style Chinese food, you are hungry again in an hour? Uh, rice, breaded meats, and sticky sweet sauces. Yeah, you ate many calories, but they were never used for energy. Those calories never got to the cells that needed them, and those cells still want some. The insulin levels rose and so the calories were put into fat, leaving other cells still “hungry.” So once the gut is empty again, you find yourself literally starving once more (the stomach distention is gone, and therefore it is easy to feel that you are hungry). So you go to the refrigerator and eat more of that leftover sweet and sour chicken with rice…
Now leafy greens will not do that. But Leafy greens are not very calorically dense so you have to eat a ton of them. Why do you think horses are eating all the time? It just takes a lot of grass to make them not hungry or allow them to build muscle and body structures. It works, but it is simply not very efficient. In terms of calories, it is far more efficient to be a carnivore.
So go to one side or the other. The “mushy middle” is the worst of all possible places to be. I can eat a very calorically restricted portion of bread and rice, or I can eat a big steak with a side of bacon and buttered broccoli and a pure cream chaser. But I can’t do both and hope to lose weight or be healthy. A big steak with a large full-leaded Coke drink is a recipe for disaster.
I think the scientific evidence is very clear that a carbohydrate-rich diet is a major problem for us. It is not fats driving the exploding diabetes problem in our country. It is carbohydrates (sugar and things that quickly metabolize to sugar). But don’t combine fats and carbohydrates. That is the worst of all possible worlds.
The next debunking is about salt.