Summary
This paper analyses historical UK food composition data to assess whether the mineral content of fruits and vegetables has changed over the twentieth century. Drawing on successive editions of McCance and Widdowson's food composition tables, Mayer reports apparent reductions in several minerals, suggesting a long-term decline in the nutritional quality of produce. The paper raises questions about the potential roles of soil depletion, changes in crop varieties, and agricultural intensification, though causal attribution is limited by the nature of the data.
UK applicability
The study is directly relevant to the UK context, as it is based primarily on UK food composition data (McCance and Widdowson). Its findings have informed ongoing UK debates about soil health, crop breeding, and the nutritional adequacy of the modern diet.
Key measures
Mineral concentrations (mg per 100g fresh weight) including calcium, magnesium, copper, iron, sodium, and potassium; percentage change over time across food composition table editions
Outcomes reported
The study examined changes in the mineral content of fruits and vegetables by comparing historical food composition data, likely drawing on UK food tables from different decades. It reported apparent declines in key minerals such as calcium, magnesium, copper, and iron across a range of commonly consumed produce.
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