2. Size of Your Stomach
There is also the size of your stomach muscle to consider. The large size portions served in restaurants and the increase of dinner plate size from 10 to 12 inches would have you believe that the stomach is one huge organ. In fact your stomach is about the size of your hand closed into a fist when empty, but expands to a fully stretched out hand when full, which can max at about 1.5 liters of food or 6.34 cups. Ideally, you want to stop eating when you are 80 percent full to allow room for digestion to occur. And most important of all is to chew your food thoroughly.
3. Your Hand As a Reference
For a quick reference, stretch out your hand and eat the size of your palm as protein, the size of your hand from wrist to tips of all 5 fingers as carbohydrates in the form of vegetables and whole grains, and your thumb as a measurement for oil, about 1 tablespoon. Depending on your body size and lifestyle you can safely eat 3-5 meals a day, consisting of a variety of food groups, of this size.