"As to his meals, I should think it best, that as much as it can be conveniently avoided, they should not be kept constantly to an hour: for when custom has fix'd his eating to certain stated periods, his stomach will expect victuals at the usual hour, and grow peevish if he passes it... Therefore I would have no time kept constantly to for his breakfast, dinner and supper, but rather vary'd almost every day. And if betwixt these, which I call meals, he will eat, let him have, as often as he calls for it, good dry bread. If any one think this too hard and sparing a diet for a child, let them know, that a child will never starve nor dwindle for want of nourishment, who, besides flesh at dinner, and spoon-meat, or some such other thing, at supper, may have good bread and beer as often as he has a stomach."
John Locke, "Thoughts Concerning Education" (1692)
Child-rearing advice from the Father of Liberalism! To nourish your child properly, you will need: (1) dry bread, (2) plenty of beer, and (3) the element of surprise.