Some of the complexity (I think) is that there are at least two different things going on: Some foods might increase the extent to which the contents of one's

Some of the complexity (I think) is that there are at least two different things going on: Some foods might increase the extent to which the contents of one's stomach end up in their esophagus. Some foods might increase the extent to which it is unpleasant if or when the contents of one's stomach end up in their esophagus.