In her book "How to Know If You are Magnesium Deficient - 75% of Americans Are", Elizabeth Lipski talks about mineral deficiencies in humans, something that is far more common that we are lead to believe. One interesting section of the book looks at the zinc content of carrots. She says that back in the 1930s, the Department of Agriculture measured the levels of nutrients in a shop bought carrot. The average carrot contained 20 mg Zinc. Around 50 years later, the average carrot contained 10 mg zinc. Today, Elizabeth guesses that the average carrot may only contain 2-5 mg zinc.
To me, this is shocking. I mean how many people realize that the fruit and vegetables we consume are getting less nutritious over time? The fact is that fruit and vegetables get a lot of their nutrients from the soil they grow in. If soils are deficient in minerals, then so will the produce that grows in that soil. Each generation of plant grown on a patch of soil will take out nutrients, and, if they aren't put back into the soil, then successive generations will grow up with lower mineral content.
Thinking about this in terms of the quantity of produce we consume, back in the 1930s, we could eat one carrot and get 30mg zinc. Today, to get the same amount of zinc you'd need to eat 6 or more carrots.








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