"Nutrition in food comes from the nutrients in the soil. Industrial agriculture, based on the NPK mentality of synthetic nitrogen, phosphorous and potassium based fertilizers leads to depletion of vital micro nutrients and trace elements such as magnesium, zinc, calcium, iron. David Thomas, a geologist turned nutritionist, discovered that between 1940 and 1991, vegetables had lost – on average – 24 percent of their magnesium, 46 percent of their calcium, 27 percent of their iron and no less than 76 percent of their copper (Ref: David Thomas ‘A study on the mineral depletion of the foods available to us as a nation over the period 1940 to 1991’. Nutrition and Health 2003; 17: 85-115) Carrots had lost 75 percent of their calcium, 46 percent of their iron, and 75 percent of their copper. Potatoes had lost 30 percent of their magnesium, 35 percent calcium, 45 percent iron and 47 percent copper. To get the same amount of nutrition people will need to eat much more food. The increase in “yields” of empty mass does not translate into more nutrition. In fact it is leading to malnutrition."

Myths About Industrial Agriculture | The Indypendent

—Vandana Shiva

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