A US woman has eaten 1,360kg of rocks over the last 20 years.
Teresa Widener sees the rocks and pebbles as her "ultimate comfort food" and enjoys sucking the mud off them, but since tying the knot with her husband Jim she has managed to quell many of her cravings.
She told Metro: "I pick the ones I like the look of. I like their earthy flavour so sometimes I just suck the mud straight off.
"Jim makes me so happy I've started eating less. But everyone has bad days and when I have one, only rocks can make me feel better."
Teresa uses a special rock hammer to break the objects into edible pieces, but her favourites are those which are soft and brittle.