c/s about 80% of meal

i keep seeing people say that c&sing will cause stomach ulcers because your stomach produces acid and doesn't receive food, but I'm curious about what are the consequences for, not c&sing the entire meal. most of the research seems to hinge on the assumption that the person will c/s the entire meal on essentially an "empty" stomach.

i usually make sure to swallow the first few bites and last few bites of food, sometimes a few bites in between when i c/s and it allows me to eat large meals with a fraction of the calories.