Summary
This paper by Mayer, Trenchard and Rayns extends earlier analyses of UK food composition data to examine trends in the mineral content of fruit and vegetables from 1940 to 2019, drawing on successive editions of government nutrient composition tables. The authors likely find evidence of substantial reductions in several minerals over the period, raising concerns about the nutritional quality of the UK food supply and the potential role of agricultural intensification, variety selection, and soil health changes. The study contributes to a long-running debate about whether changes in farming systems have reduced the micronutrient density of plant foods.
UK applicability
This study is directly applicable to the UK context, as it is based entirely on UK food composition data and has direct relevance to UK agricultural policy, dietary guidelines, and ongoing discussions about soil health and farming system reform.
Key measures
Mineral concentrations (mg per 100g fresh weight) including calcium, magnesium, iron, copper, potassium, sodium, and zinc; percentage change over time across multiple food composition datasets (1940–2019)
Outcomes reported
The study examined changes in the mineral content (e.g. calcium, magnesium, iron, copper, potassium, sodium) of commonly consumed fruits and vegetables in the UK across eight decades, comparing data from government food composition tables. It reports likely declines in several key minerals over the period studied.
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