Pregnancy brings all sorts of odd cravings, and for some people that extends beyond food entirely, into clay, chalk, soil or ice. That's pica, the urge to eat non-food substances, and it's a lot more common and a lot more documented than most people realise.
In pregnancy specifically, pica often shows up as geophagia, craving earth-based materials like clay or soil, and it's been recorded in medical literature for centuries, particularly among pregnant women in parts of Africa, Asia and the southern US.
Nobody's entirely sure why it happens, but a few explanations come up consistently. Some studies link it to low iron or zinc, the idea being the body reaches for certain substances to compensate for what it's missing, though the evidence here is genuinely mixed rather than settled. In plenty of places it's cultural tradition, passed down through generations and tied to ideas of cleansing or morning sickness relief. And for others it's simply sensory comfort, the texture or earthy flavour offering something soothing during a period of heightened senses and shifting hormones. Whatever the reason, it deserves empathy rather than judgement, cravings during pregnancy are deeply personal.
Health professionals are fairly consistent on this: mild pica isn't automatically harmful, but it can carry real risk, mainly around contaminants or heavy metals in unclean or unknown soils and clays, digestive issues if larger amounts interfere with absorption, and infection risk from anything that hasn't been properly treated. Because of that, most midwives and doctors recommend talking about these cravings openly rather than hiding them, it's genuinely nothing to be embarrassed about, and it's something that can be managed safely with proper guidance.
If you're pregnant and craving clay or chalk, speaking to your GP or midwife first is the right move. They can check for deficiencies, offer supplements where needed, and help you find a safer way to manage the craving if it persists. Some people do explore food-grade, properly tested clays from trusted sources for the sensory side of things, but even with clean, natural products, checking with a healthcare professional first is still the sensible call during pregnancy specifically.
Pica and geophagia in pregnancy are more common than most people know, and while they're often harmless, they deserve proper care and professional input rather than guesswork. If this is you, you're not doing anything wrong, it's just worth treating as a cue to check in with your body and your healthcare provider.
Disclaimer: This article is for educational purposes only and is not medical advice. Please speak to a qualified healthcare professional before consuming any non-food substance, particularly during pregnancy. My products are intended for adult hobby use only and are not certified food-grade.
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