You'd be shocked at how small the hole going through the band is, I've heard once you're filled it's between the size of a dime and a nickle (the standard un-banded sized opening is the size of a sillver dollar) {that may not mean alot to you Canadians, lol eh?} your ideal "bandster bite" is the size of the eraser on a pencil or the size of a pea. So if you imagine a pipe the size of a nickle you'll find that if you stack up enough pea's (smashed or not) that they will still back up into the band (this is when you get the feeling of fullness).
I have felt full by eating mashed potatoes which are already almost liquid (not a lot of chewing required) so if those are able to stop up the band (in a good, feeling full way) then small bites of anything chewed to mush would also stop up the band. This is also why it's important not to drink with meal, the liquid would just wash the mushed food through the band making you feel hungry sooner!