I did quite some experimenting with this. Fruit moves fastest and green leaves. Meat, cheese, oil and fats slowest. But we often eat combinations: and the slowest component of your food determines the speed of the whole. Also: it's a one lane road and "over taking" is not possible. So, eating a fast moving meal after a slow moving meal results in the fast mover getting stuck behind the slow mover. Hence I start my da…
Just to be clear I thought the typical advice has been fiber -> protein -> carbs, for blood sugar reasons, you're saying to frontload fiber/carbs & backload proteins for easier digestion? That is interesting, I wonder what studies there are on this.
Another reason I do it like this: I get no after diner dip from fast moving food. Slow moving food makes me crash a little, and I prefer to experience that in the evenings.
I did also experiments with fruit (and leaves) only diets. No crashes at all. Nice! But I did crave savory, chewy food a lot.