not to get down in the weeds but carrots aren't very fibrous, but their fiber content goes up 2.5x when you boil them, from about 2g per stick to 5g. leafy greens, especially kale, are better for filling up. and you still need protein and fat on top of that.

How does boiling increase the fiber content of carrots? Where does the extra fiber come from?

cooking breaks down cell walls which makes nutrients more available. but overcooking can destroy them.

I will try this.

I wonder if the satiated feeling isn't from volume but from some nutrient showing up in blood or in intestinal detectors for something signaled as in short supply.

I think the satiated feeling is from your body having enough fat. Rich, heavy meals will trigger it.

Carbs cause the opposite, they trigger the need to eat more (carbs).

is that from the glycemic index being suboptimal, in the ingested carbs?