Using the Stuffing Yourself option is actually one of the less effective ways to stretch your stomach, since it will fill your stomach to exactly the Food Coma point and no higher. However, one of the last updates changed the fridge around, so that there is a set limit to the amount of food that is in the fridge. That means that if your stomach capacity is high enough to eat all the food in the fridge and have room for more, then you will be able to eat more and go about your day.
This change acts as a bit of a double-edged sword. On one hand, it means that you don’t have to click nearly as much at higher capacities, since you can just skip most of the clicking by stuffing yourself. On the flip side, it also sets a limit to how high your capacity can be, since the fridge now only has a limited amount of food, and you have only so many actions each day. Especially at higher weights, since certain milestones increase the amount of “energy points” (of which you have 15 as of the latest update, though it used to be 20) you spend on each action.