Summary
This paper by David Thomas, published in Nutrition & Health in 2003, analyses longitudinal changes in the mineral content of UK foods by comparing data from successive editions of McCance and Widdowson's food composition tables spanning much of the twentieth century. The analysis suggests substantial reductions in the concentrations of several essential minerals — including iron, magnesium, copper, and zinc — in commonly consumed foods such as vegetables, fruit, meat, and dairy. The work raises questions about the implications of such trends for dietary adequacy and public health, and points to intensified agricultural practices, soil depletion, and changes in food processing as plausible contributing factors.
UK applicability
The study is directly and exclusively applicable to the UK context, drawing on UK-specific food composition data and government nutritional tables; its findings are pertinent to UK dietary guidance, agricultural policy, and ongoing debates about soil health and food quality.
Key measures
Mineral concentration (mg per 100g fresh weight) for multiple nutrients across food groups; percentage change over time derived from successive editions of UK food composition tables
Outcomes reported
The study reports comparative mineral concentrations in UK foods across multiple time points, drawing on historical food composition data to quantify changes in mineral content over decades. It likely documents statistically significant declines in key minerals such as iron, calcium, magnesium, copper, and zinc across a range of food categories.
Topic tags
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