Agricultural soils are progressively depleting, resulting in foods having lower nutrient density than in the past.
"especially since like our soils are being progressively depleted and the foods maybe aren't quite as nutrient-dense as they they used to be." (said at 0:24:26)
The claim that progressive soil depletion is causing crops to be less nutrient-dense than in the past is contradicted by agricultural and food-composition research. Long-term studies and analyses of archived soil samples from cultivated land show that soil mineral content has not generally declined over time under standard agricultural management. While some modern crop varieties do exhibit lower mineral concentrations compared to older cultivars, this is primarily driven by the well-documented "genetic dilution effect"—where selective breeding for higher yields and dry-matter accumulation outpaces the plant's mineral uptake—rather than depletion of soil minerals. Additionally, historical comparisons of food composition tables from different eras suffer from major methodological differences in sampling, crop varieties, and analytical chemistry.
- context: Declining Fruit and Vegetable Nutrient Composition: What Is the Evidence? (HortScience 2009)
"recent side-by-side plantings of low- and high-yield cultivars of broccoli and grains found consistently negative correlations between yield and concentrations of minerals and protein, a newly recognized genetic dilution effect." (abstract, results, passage verified)
openalexfull study (doi) - contradicts: Mineral nutrient composition of vegetables, fruits and grains: The context of reports of a… (Journal of Food Composition and Analysis 2016)
"Comparisons with matching archived soil samples show soil mineral content has not declined in locations cultivated intensively with various fertilizer treatments. Contemporaneous analyses of modern versus old crop varieties grown side-by-side, and archived samples, show lower mineral concentrations in varieties bred for higher yields where increased carbohydrate is not accompanied by proportional increases in minerals – a “dilution effect”." (abstract, results, passage verified)
openalexfull study (doi)