I want to see the study. If we are saying that average mineral content of calcium, magnesium, and iron in cabbage, lettuce, tomatoes, and spinach has dropped 80–90% between 1914 and 2018, where were the subject vegetables taken from? Are we needing to look at farming methods, large agriculture process such as early harvest, soil depletion, delivery method, sun exposure, etc?<p>And, if we are looking at findings from the USDA, Agricultural Research Service and USDA National Nutrient Database for Standard Reference, they really need to update their research. As stated by the study's author, " the USDA mineral content of vegetables and fruits has not been updated since 2000"