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Whenever I see a piece of chalk I have this immense desire to eat it. Same goes to clay. I crave them so badly, and it's been like this since I was a kid.
Talk to your doctor. Those are symptoms of Pica, an eating disorder where you crave those things specifically.
Clay is safe and beneficial even chalk can be used to settle an upset stomach or for heart burn sometimes your body craves things because you have deficiencies . There was a man lost at sea for a couple months he had no problem catching fish and eating the meat but after awhile he began to crave the livers eyes and brains of the fish because they carry vitamins and nutrients not just calories
Terezi, is that you?
But in all seriousness, like others have previously said, ask your doctor about it.
I can't imagine quantities of either, is very safe for human consumption.