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I have just come across this article yesterday. I have heard about it before from various people that our fruits and vegetables are no longer as nutritious as before but one can never be too careful with having reliable information these days. However reading it in a credible paper gives me some comfort.

A landmark study on the topic by Donald Davis and his team of researchers from the University of Texas (UT) at Austin’s Department of Chemistry and Biochemistry was published in December 2004 in the Journal of the American College of Nutrition. They studied U.S. Department of Agriculture nutritional data from both 1950 and 1999 for 43 different vegetables and fruits, finding “reliable declines” in the amount of protein, calcium, phosphorus, iron, riboflavin (vitamin B2) and vitamin C over the past half century. Davis and his colleagues chalk up this declining nutritional content to the preponderance of agricultural practices designed to improve traits (size, growth rate, pest resistance) other than nutrition.
The full article is available on the below link:

https://www.scientificamerican.com/article/soil-depletion-and-nutrition-loss/#

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