Of course it is common sense and not tables. Once you understand about whcih food contains more or less starch- you don't need to consult tables. But fact is fact, new potatoes contain less starch than the type normally used for baking, which are older. And of course a small baked pot is ok as part of your meal if that is what you choose. But low GI (eg low starch) and high fibre are not quite the same thing- although both help. For people who are pre-diabetic, it is the GI which is the most important- but wholefood and more fibre is of course good too. As you say, common sense ;)