You cannot feel full with just your mouth

Your mouth learns taste, not nutrients. Which is how you get fat fast eating what tastes good.

There are two ways to feeling full, one through required amino acids and another through taste. The idea that something is tasty will keep signaling you to eat more. The idea that a food is full of amino acids that you need will also make you eat more.

The issue is that your mouth cannot sense the nutrient pathway, only though taste.

The mouth can only learn taste association, it can’t learn nutrient content.” – Huberman

So you can get really fat really fast if you rely on what’s tasty as an indicator of fullness.