Myself ... I get full eating food. Carbs, protein, whatever it is. If I eat a lot of it, I'm full.
I guess what I find interesting and the point of my response is that there is clearly a difference from person to person in how their body produces the "full" feeling. Somehow in your case, a belly full of carbs, blocks (or inhibits) that full signal from firing?
Me? I get full on food, including carbs.
Sometimes on a weekend day for a treat I go to a cafe in the morning. When I'm there I eat a donut and a bagel and that will be the only thing I eat in the whole day, I feel full after eating it and I am plenty satiated for the rest of the day even though "broscience" tells me I should be starving again a half hour later.
Put a saltine in your mouth and start chewing it, without swallowing. Note the amount of time required until it starts to taste sweet.
Anecdotally, I never taste sweetness from this test. And I do not feel satiated by high-carb foods. I could eat spaghetti until I'm basically the gluttony murder victim from "Seven". The satiety signal from carbs is almost completely absent. The feeling of fullness only comes from the physical stretching of the stomach, or from other macronutrients.
That's why low-carb diets work better for me. I eat less when only eating foods that make me feel as though I have eaten at all.
If you are low in the amylase enzyme then I would actually expect carbohydrates to NOT cause weight gain. Doesn't that enzyme break down complex carbs into consumable (usable) simple sugars?
Gut biota will also make their own amylases.
An amylase blocker causes carbohydrate malabsorption, and that is about the same as a lactose-intolerant person consuming lactose. The starches end up getting fermented in the intestine. The gut biota will consume most of them, but I suppose it is possible they might drop some on the floor for the intestine to absorb.
My hypothesis is that the slower rate of digestion of starch produces a lesser effect on perceived satiety.
If I binge on bananas, fruit, and veggies etc I feel stuffed too. In fact to the point where I lost ~30 lbs in 40 days because I couldn't eat enough calories. The "potato hack" leverages a similar property with starch.
Fiber & fat both make you feel very satiated.
This causes the starch to become more resistant to digestion and lowers the glycemic index of the food. Potatoes are already pretty good for satiety, and retrogradated potatoes are filling and slower to digest.
It also makes sense that a diet that generates ketosis so that you lose weight quickly (e.g. protein-heavy/carb-light) would be accompanied by feelings of hunger.
There is a lot of evidence that periods of food scarcity in childhood have a profound impact on our body chemistry and the way our body feels hungry or metabolizes food.
A problem with this statement is that you're assuming the average is applicable in a uniformly distributed manner. People who are obese (or morbidly obese) and in the lower income quartile could consume little to no protein, and still you could have a higher protein content in Americans' diets. On average.
Apparently half of America is deficient in one or more micronutrients (ie vitamins, minerals, etc) as well. It’s shocking.
After even a medium-sized protein shake I don't even want to look at food, but if I skip the protein and mainly build it with fruits and such then I'm hungry much sooner all the while consuming the same (or more) volume of stuff.