Another part is nobody wants the real advice, because it's often hard.
See how many diet books are sold, and see how few people actually successfully lose weight, even though the advice boils down to "stop eating so much".
Maybe that's what makes real advice so hard - too many people making glib blanket statements on the Internet. Actual advice always targets individuals, and it's never a single thing that it boils down to.
See how many diet books are sold, and see how few people actually successfully lose weight, even though the advice boils down to "stop eating so much".