There are no “quick fixes” when it comes to losing weight, but if you’re looking for a way to “trick” your stomach into getting “smaller,” try eating smaller meals throughout the day.
The science is split on whether or not eating smaller meals more frequently will help you lose weight, but what it will do is make your stomach less stretchy, which in turn will help you to feel fuller when eating less food.
To be clear, it’s unknown if the actual size of your stomach can change. Most people’s stomachs hold about one liter of liquid, whether you’re 150 pounds or 300 pounds.1 However, it has an ability to stretch and expand when you eat a meal.
If you regularly eat large meals, your stomach’s distensibility (or ability to become stretched) will increase to accommodate the food. If you instead eat only small amounts at a time, your stomach’s distensibility will decrease.