科学与数学ncbi.nlm.nih.gov
蔬菜矿物质含量自 1914 年以来下降高达 90% 的说法
Estimates that mineral levels in vegetables have dropped by up to 90% since 1914
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导读
这篇发表于 NCBI 的综述论文估计，自 20 世纪初以来，美国和英国蔬菜中的矿物质含量（尤其是镁）大幅下降，降幅可能高达 80–90%。文章将这一现象归因于土壤中矿物质的持续流失，并指出早在 1930 年代就有报告向国会发出过类似警告。
为什么经久不衰：它触及现代农业、土壤健康与营养学交叉的长期争议，且数据来源和结论都存在可检验的细节，适合反复讨论。
HN 评论精选
土壤退化是耕作方式造成的，可以通过再生农业恢复。
这源于现代农业实践（重度翻耕、施肥和单一种植）对土壤生命的消灭。死去的土壤更容易被侵蚀，需要越来越多的合成肥料才能种出东西。美国流失的土壤比产出的粮食还多。通过改变耕作方式让土壤恢复生机，土壤肥力可以回到历史水平。把土壤当作活的生物来对待，好处包括提高肥力、水分渗透、保水和养分可用性，还能减少或免除合成肥料。
tastyfreeze查看英文原文
This happened due to extermination of soil life through modern farming practices of heavy tilling, fertilizing and monoculture crops. Dead soil is more susceptible to erosion and requires ever increasing amounts of synthetic fertilizer to grow anything. More soil has been lost from the US than the amount of food that has been produced. Soil fertility can be returned to historical levels by changing farming practices to make living soil. The benefits of treating the soil as a living organism include increased fertility, water infiltration, moisture retention, and nutrient availability as well as decreasing or eliminating synthetic fertilizer requirements. https://theweek.com/articles/554677/america-running-soil This is a long video but it has completely changed my home gardening practices. https://www.youtube.com/watch?v=uUmIdq0D6-A
个人经历佐证：不同产地食物品质差异可能真实存在。
过去几个月我住在乌克兰，一直想弄清为什么这里的食物（尤其是蔬菜）这么好吃。同样的菜在基辅的中档餐厅里比我在加拿大吃过的都美味。回加拿大短暂探访时，我的身体还在想念乌克兰食物。这篇关于蔬菜矿物质含量的研究或许能解释原因。我很想看到东欧农业与北美农产品的对比研究。乌克兰曾是苏联的“粮仓”，一定有原因。移民海外的乌克兰人常抱怨食物失去味道——我以前以为只是乡愁，但这项研究为他们的抱怨提供了一些潜在的科学依据。
igammarays查看英文原文
I’ve been living in Ukraine for the past few months, trying to figure out why the food here, especially the vegetables, simply taste so good. The very same dishes (e.g. steak and veggies) from popular mid-range restaurants are far more enjoyable to me over here in Kiev than I ever ate in Canada. When I went back to Canada for a brief visit, my body was craving Ukrainian food. Now this study on vegetable mineral content may explain why. I’m very keen to see a comparison study on Eastern European agriculture and produce versus North American. Ukraine was once the “breadbasket” of the Soviet Union, so there must be an explanation. Ukrainians who migrate to other countries are often said to complain about a loss in food taste - previously I assumed that was just some form of homesickness, but this study lends some potential scientific ground to their complaints.
现代农业把种菜变成成本最小化问题，牺牲了品质。
种植食物已经变成了一个工程问题，人们认为投入最少的资源就能解决。消费者会买什么、你能以多便宜的成本生产什么，谁就赢。我们那些没有味道的蔬菜就像廉价的 Bose 音箱（没有高音、没有低音，只能是 Bose）或沃尔玛的压制纸板家具。表面上看起来像蔬菜该有的样子，但味道和内在的东西完全缺失。
JohnJamesRambo查看英文原文
Growing food has turned into an engineering problem where people think you solve it by investing the least possible resources into it. Whatever the consumer will buy and you can produce as cheaply as possible wins the day. Our tasteless vegetables are like cheap Bose (no highs, no lows, must be Bose) speakers or pressed paper furniture at Walmart. On the surface they look like a vegetable should look, but the taste, what’s inside, is completely deficient.
核查引用后发现论文的 80–90% 降幅说法夸大，实际证据只支持 5–40%。
论文写道“估计美国蔬菜的镁含量下降了 80–90%”。但参考文献 11 并不支持这一说法；文献 12 没直接提到镁，只说某些营养素下降了 5–40%，远不是 80–90%；文献 13 虽提到镁，但说的是不到 20%。……我觉得我被这篇论文坑了。
CraigJPerry查看英文原文
The BBC more or less episode with James Wong is making me wonder if this is true (shorter summary of what James said on the podcast: https://mobile.twitter.com/Botanygeek/status/984708381507276801 ) Anyway, from the paper here: >> with estimates that vegetables have dropped magnesium levels by 80–90% in the U.S. (Figure 2) and the UK [11,12,13,32,33] Reference 11 doesn’t support this claim. Ref 12 doesn’t directly mention Mg but does say some nutrients have dropped between 5-40% which is NOT 80-90% Ref 13 does mention mg specifically on page 3 but states under 20%. … I think i’m being fleeced by this paper.
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