Dirt, adult ingestion

For the majority of persons beyond the age of 5-6, the daily uptake of dirt due to intentional ingestion should be quite low. One route by which adults ingest dirt is presumably fruits and vegetables and nearly all of it is due to leafy vegetables... 

These data suggest that the daily ingestion of dirt and dust by adults is unlikely to exceed 0-5 mg/day even if all of the 137 g of leafy and root vegetables, sweet corn and potatoes consumed by adult males each day were replaced by family garden products. 

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