FactSentinel

The claim that spinach's reputation for high iron content stems from a decimal point error is a popular myth that has been widely repeated but does not hold up under scrutiny. The story usually goes that a misplaced decimal in the 1870s, often attributed to German chemist Erich von Wolf, caused spinach's iron content to be recorded as ten times higher than it actually is. However, historical research into this claim has failed to find solid evidence supporting it. The tale appears to have originated from a 1981 paper and gained further traction in a 1990s British Medical Journal article, both of which relied on secondhand accounts rather than verifiable primary sources.

Spinach does contain a respectable amount of iron, roughly 2.7 milligrams per 100 grams when cooked, which is high compared to many other vegetables but not exceptional compared to red meat or organ meats. The real nutritional caveat about spinach is not about a measurement error but about bioavailability: spinach contains oxalates, compounds that bind to iron and inhibit the body's ability to absorb it efficiently. This means that while the iron content itself is accurately measured, the amount your body can actually use is lower than the raw numbers suggest.

The persistence of the decimal point myth illustrates how scientific folklore can spread without rigorous sourcing, especially when it offers a neat, ironic narrative. While it's not possible to definitively rule out that some early measurement discrepancy occurred, no credible historical documentation confirms the specific decimal error story, making it more legend than established fact.