~Femur
I'd like to address your idea about eating "lowest calorie density foods".
As I explained, once we understand that the calories we eat mean nothing, we can see how eating low-density foods makes no sense either. But let's delve a bit deeper in this idea.
What are low-density foods? What are they not? They are not meat, and they are not fat. This means they are all plants, and they are all carbohydrates. Carbs contain 4 kcals per gram, fat contains 9 kcals per gram. We could say meat contains protein, and protein contains 4 kcals per gram, so that would be OK, if we only eat the lean meat. Maybe. For now, let's just look at carbs and plants.
The first question we have to ask is can we digest those low-density foods? After all, if we can't digest them, they're not really food, are they. There's basically two kinds of carbs. Digestible, indigestible. Right there, we can ignore all indigestible carbs, since we can't digest them, so they're not food. All we have left is the digestible carbs. What are they, exactly? Glucose, fructose, sucrose. That's about it. By the way, sucrose is plain old table sugar, and it's made of half glucose and half fructose. So basically, when you're saying "eating the lowest calorie density foods", what you're really saying is "eating sugar".
Maybe you meant something else by "lowest calorie density foods", but that's what I understand.
If you do think indigestible carbs are food, then you have to explain to me why I should starve myself by eating foods that give me exactly zero calories and zero nutrition. They're called "indigestible carbs" for a reason. If I can't digest them, then I can't extract any energy or nutrition out of them, now can I. If I'm starving even though I eat, then we call this a semi-starvation diet. Ancel Keys did an experimental study on semi-starvation back in the '40's. The result? Emaciation and neurosis.
Let's recap.
When you're saying "eating lowest calorie density foods", either you're really saying "eating sugar", or you're really saying "eating a semi-starvation diet". Somehow I think that's not what you meant either way, but there it is. I welcome clarification on what you really meant.
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