Dave, "gall" in gallstones means "bile" not "gall"bladder ... matter of fact gallbladder means "bile"bladder. So not having a gallbladder has nothing to do with the need to flush.
1/2 cup of say organic fresh grapefruit juice would have what effect on your diabetes??? My mama has diabetes and I have her eating fruit and drinking juice and it doesn't mess with her #s.