Well they're not idiots. There's a genetic...

Well they're not idiots. There's a genetic predisposition for sure.

And the tasting of the urine is accurate back in the day. Its called glycosuria. Your kidneys have a threshold for glucose. Once reached, then it comes out in your urine.

There is more than one type of diabetes. The version most are familiar with is Type2. Which as much as will be unpopular with people and very un-PC is just fat and lazy disease. And when I say fat, I mean high visceral adiposity. Not necessarily sub-cut fat. So you can be skinny and have T2DM.

Complex disease. Easy solution for most. Move more and choose better quality foods. Don't over indulge.