Summary
White and Broadley analysed historical UK and USA food survey data to investigate whether the mineral composition of edible horticultural products had changed between the 1930s and 1980s. They found statistically significant declines in multiple mineral concentrations: UK vegetables showed reductions in Cu, Mg and Na; UK fruits showed declines in Cu, Fe and K; USA vegetables showed reductions in Ca, Cu and Fe; and USA fruits showed declines in Cu, Fe and K. The authors note that whilst these compositional changes are measurable, horticultural products contribute relatively modestly to overall dietary mineral intake in the UK, limiting the nutritional significance of these historical shifts.
Regional applicability
This study was conducted in the United Kingdom and directly analysed UK food survey data from the 1930s and 1980s, making findings directly applicable to UK agricultural history and dietary patterns. The parallel analysis of USA data provides useful comparative context, though UK-specific results remain the primary evidence base for understanding nutrient density trends in British horticultural products over this period.
Key measures
Dry matter concentrations of copper (Cu), magnesium (Mg), sodium (Na), calcium (Ca), iron (Fe), and potassium (K) in vegetables, fruits and nuts
Outcomes reported
The study measured and compared mineral concentrations (Cu, Mg, Na, Ca, Fe, K) in vegetables, fruits and nuts from food survey data spanning the 1930s to 1980s in the UK and USA. Historical changes in mineral composition were quantified to test whether nutrient density had declined over the 50-year period.
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