Vegetables Less Nutritious as Soil Quality Declines

By the Editorial Team · Wednesday, October 7, 2026

Researchers at Deep Science Ventures found that the mineral content in fruits and vegetables has dropped by up to 50 percent since the 1960s, largely due to declining soil quality and farming practices focused on yield over nutrition. This nutrient loss means consumers must eat significantly more produce to meet mineral needs, raising health concerns and prompting calls to revise dietary guidelines and adopt soil-restoring agricultural methods.

A recent study conducted by researchers at Deep Science Ventures has revealed a significant decline in the nutritional content of fruits and vegetables over the past six decades, with some key minerals decreasing by as much as 50 percent. The findings suggest that modern crops contain substantially lower levels of essential nutrients such as potassium, magnesium, and copper compared to produce grown in the 1960s.

According to the report, this decline in nutrient density means consumers now need to eat roughly twice the amount of vegetables to receive the same mineral intake as previous generations. The researchers attribute this trend primarily to deteriorating soil quality and agricultural practices that prioritize crop yield and rapid growth over nutritional value.

Will Summers, a senior associate at Deep Science Ventures, emphasized the shift in agricultural focus, stating that while food production has increased in terms of calories and volume per hectare, the nutrient content within food has diminished. He highlighted that common vegetables including peas, carrots, and onions have been notably affected by this decline.

The study raises particular concerns for segments of the population such as vegetarians and vegans, who represent approximately 14 percent of the UK population, as well as individuals taking weight-loss medications. Summers noted that those on such treatments may consume less food overall, intensifying the impact of reduced nutrient availability. Deep Science Ventures estimates that up to 5 million adults in the UK taking weight-loss drugs could be at risk of insufficient intake of vital vitamins and minerals.

The nutritional shortfall carries health implications: a deficiency in minerals like zinc can impair immune system function, while low potassium levels have been linked to a higher risk of stroke by up to 21 percent. Given these concerns, the study suggests that public health guidelines such as the “five a day” recommendation for fruit and vegetable consumption—initiated in the late 1980s—may warrant revision to reflect current nutrient levels.

Researchers advocate for the adoption of nature-friendly farming practices designed to restore and maintain soil health, which they identify as fundamental to improving nutrient density in crops. Sian Ferguson of the Mark Leonard Trust, an organization involved in the study and established by the Sainsbury’s family to support agricultural initiatives, stated that rebuilding soil health is among the most effective strategies to enhance both nutrient levels and crop yields.

The report underscores the critical connection between soil quality and food nutrition, suggesting that addressing soil degradation could play a pivotal role in securing the long-term nutritional quality of fruits and vegetables.

This article was reported by synthesizing coverage from multiple independent news outlets to present a balanced, unbiased account. Read about our editorial standards. Spotted an error? Let us know.