Liquids tend to feel like they are very heavy in your stomach. The formula can really make you feel full. I would check with your doc and ask them to get a nutritionist involved to help you. Have you had a swallow test done? This will make sure you can physically eat and drink without it going into your lungs. A nutritionist will also be able to help you with why you feel full so quickly.

I kinda think you are right, after going thru oral cancer that a persons stomach must shrink. Before cancer I would be able to eat a big meal, now forget it. I will be starving and at the most I will be able to eat 2 cups of food. Thats pushing myself to eat a few more bites too. I usually only eat around a cup at a time which is why Im always starving. The cup of yogurt is the perfect sized small meal for me. I could eat 2 of them and that would be enough but then an hour later Im hungry again.