Entertaining the silly argument we have gotten ourselves into: Solid food does not just fall into our stomachs normally, the processes of swallowing is quite complex and involves mechanically pushing food down through peristaltic waves in multiple phases. Liquids are another story though.
It is entirely baseless of course, but I imagine that the difference for solid foods between a the small aid of gravity, unable to make the food move on its own, and having no aid is probably significantly less than the difference between no aid and an opposing force. And yet in either case, the process of swallowing remains exactly the same, always having to force the food down with the same motion but different effort.