Most of us carry an assumption: that if we eat our vegetables, we are giving our bodies what they need. For most of human history, that assumption was correct. The soil held what the plant needed, the plant held what we needed, and the cycle sustained itself.
That cycle has been breaking down for decades. The vegetables are still there. The minerals, in many cases, are not.
I was eating well by every standard measure. I still felt like something was missing. It turned out something was.
The Numbers Are Hard to Ignore
In 2004, researcher Donald Davis and colleagues at the University of Texas published a study in the Journal of the American College of Nutrition comparing USDA nutritional data for 43 garden crops between 1950 and 1999. The findings were significant: measurable declines in protein, calcium, phosphorus, iron, riboflavin, and vitamin C across the board. The crops looked the same. The nutritional content did not.
In 2003, British nutritionist David Thomas published a detailed analysis in the journal Nutrition and Health comparing the mineral content of 27 commonly eaten foods using UK government food composition tables from 1940 and 1991. What he found matched the American data: across the board, vegetables, fruits, and meats had lost significant percentages of their mineral content over those fifty years. Magnesium in vegetables dropped by an average of 24 percent. Iron in some cuts of meat fell by as much as 54 percent. Copper, which the body needs for connective tissue, nerve function, and iron absorption, declined in vegetables by an average of 76 percent.
A similar study by Anne-Marie Mayer, published in the British Food Journal in 1997, tracked the mineral content of 20 fruits and vegetables between 1936 and 1987 using published government data. She found consistent and significant reductions in calcium, magnesium, copper, and sodium across nearly every food examined.
These are not fringe findings. American and British government nutritional databases tell the same story across different decades and different countries. The food looks the same. The minerals are not there.
What Changed in the Soil
The story begins underground, with what farming became in the twentieth century.
For most of agricultural history, land was rotated, rested, and returned to. Animal manure, composted plant material, and diverse cropping rebuilt what each harvest took. That changed with the industrialization of agriculture. Modern conventional farming relies heavily on NPK fertilizers (Nitrogen, Phosphorus, and Kalium — the chemical name for potassium), which grow large, fast, visually impressive plants. What NPK does not replace is the full spectrum of trace minerals: magnesium, zinc, selenium, boron, manganese, copper, chromium, and the dozens of others the body depends on.
Dr. William Albrecht, chairman of the soils department at the University of Missouri and one of the most important soil scientists of the twentieth century, spent his career documenting the relationship between soil mineral density and the health of everything grown in it. His collected writings, published as The Albrecht Papers in volumes from 1975 to 1992, make a sustained case that human health tracks directly with soil mineral content — and that the erosion of that content is an erosion of nutritional value we cannot see on the surface.
Continuous monoculture accelerates this depletion. Growing the same crop on the same land year after year pulls the same minerals from the soil repeatedly without replacing them. Add to this the loss of topsoil through erosion — it is estimated that the United States has lost roughly half its original topsoil in the last 150 years — and the thinning of the soil’s microbial life, which is what makes minerals bioavailable to plant roots in the first place, and you have a compounding problem that no amount of NPK fertilizer addresses.
A plant can only take up what is there. If zinc is absent from the soil, the plant cannot manufacture it. That carrot in your bag grew. It just did not have the minerals to pass on.
Food Minerals vs. Water Minerals
There are two primary ways the body has historically received minerals: through food and through water. Both have been compromised in the modern world, though in different ways.
The food mineral story is what this article is about — depleted soils producing mineral-light food. The water mineral story is covered more fully in Hydration and Minerals: Why Water Alone Is Not Enough, but the short version is this: reverse osmosis, heavy filtration, and municipal water processing strip the dissolved minerals that natural spring and well water once carried reliably. Many people today drink mineral-free water without realizing it.
Together, these two losses create a gap. The body’s requirement for minerals has not changed. The supply has.
Why Minerals Matter More Than Most People Know
Minerals are not optional accessories to nutrition. They are structural and functional essentials. Magnesium alone is required as a cofactor in more than 300 enzymatic reactions — energy production, protein synthesis, nerve transmission, blood sugar regulation, and DNA repair among them. Zinc drives immune response and wound healing and is involved in the production of over 300 enzymes. Selenium is essential for thyroid function and a potent antioxidant in its own right. Copper, often overlooked, is needed to form hemoglobin, maintain connective tissue, and support the nervous system. Chromium is involved in insulin signaling. Boron supports bone density and cognitive function.
Linus Pauling, who won two Nobel Prizes and spent the later decades of his career studying nutrition and its relationship to disease, put it plainly: “You can trace every sickness, every disease, and every ailment to a mineral deficiency.” That is a strong statement, and a deliberately provocative one, but the underlying point — that mineral insufficiency is a root, not a footnote — is supported by a significant body of research.
When the body is running low on even one mineral, compensations begin. Enzymes work less efficiently. Immune responses slow. Hormonal signaling becomes imprecise. These effects are rarely dramatic enough to name as a disease. They are more often felt as fatigue that does not make sense, sleep that does not restore, a vulnerability to illness that seems out of proportion. Mineral insufficiency is one of the more underrecognized contributors to the chronic low-grade unwellness many people have come to accept as normal.
The Case for Real Salt
Table salt is sodium chloride, refined and stripped of everything that was not sodium or chloride. It is the mineral equivalent of white flour — functional in a narrow sense, but a shadow of the original.
Real unrefined salt — Celtic sea salt being among the most studied and trusted forms — is a different substance. Harvested by hand from the coastal salt pans of Brittany, France, using methods that have not changed in centuries, Celtic grey salt retains its full complement of trace minerals. Its distinctive grey color comes from the clay of the harvest beds and is a sign of its mineral content, not a flaw. It contains magnesium, potassium, calcium, zinc, iron, iodine, and dozens of trace elements in naturally balanced proportions. Its sodium content is lower than refined table salt, and its mineral profile is closer to blood plasma than any processed salt.
The distinction matters not just nutritionally but because of what real salt offers that supplements in capsule form do not: minerals in their natural ionic form, already dissolved and in proportion to each other, the way the body evolved to receive them.
A Note on Quality and Heavy Metals
Not all sea salt is the same, and this is worth saying directly. The oceans carry pollution now, and some commercial sea salts — particularly those harvested from industrially affected coastal waters — have been found to contain measurable levels of microplastics and heavy metals including lead, cadmium, and arsenic. A 2018 study published in Environmental Science and Technology by Seung-Kyu Kim and colleagues found microplastics in 90 percent of sea salt brands tested across 21 countries.
This is not a reason to avoid sea salt — it is a reason to be selective about the source. Celtic sea salt from established traditional producers in Brittany is harvested from protected, monitored coastal waters and is routinely tested for heavy metal content. Redmond Real Salt, mined from an ancient seabed in Utah, is another well-regarded option from an uncontaminated inland source.
Himalayan pink salt, mined from ancient inland sea deposits, is also widely available — but not all Himalayan salt is equivalent. Quality varies significantly by origin, and some products sold as Himalayan salt have been found to contain measurable heavy metals including lead and cadmium. If you choose Himalayan salt, check the country of origin on the label. Salt from Pakistan — specifically from the Khewra mine region — is generally considered the more reliable source, as it comes from a well-established deposit with a longer testing history. Avoid products that do not list a country of origin.
What Supplementing Looks Like in Practice
Supplementing minerals does not have to be complicated. A few practical approaches:
Use real salt instead of table salt. This is the simplest daily step. Switching to Celtic grey salt or Redmond Real Salt means every time you season food, you are adding a small, natural dose of trace minerals rather than refined sodium alone.
Consider a trace mineral supplement. Liquid trace mineral concentrates — typically derived from Great Salt Lake brine or similar ancient mineral-rich water sources, with sodium removed — offer a broad spectrum of trace elements in ionic form. A few drops in a glass of water daily is a low-effort, high-impact habit.
Prioritize magnesium. It is one of the most commonly deficient minerals in the modern diet and one of the most important. Magnesium glycinate is well absorbed and gentle on digestion. Magnesium malate is useful for energy. Topical magnesium (magnesium chloride flakes dissolved in water and applied to skin) is an option for those who do not absorb oral supplements well.
Eat organic when it matters. Organic produce does not guarantee mineral density — soil quality varies — but organic certification requires longer rotation practices and prohibits many of the synthetic inputs that accelerate mineral depletion. It is a meaningful tilt in the right direction.
I put a pinch of Baja Gold sea salt in a glass of water each morning as part of my daily routine. The difference in my energy through the day has been real — and most noticeable in hot weather, when I used to feel more sluggish by afternoon. It is one of the simplest things I have done consistently for my body, and one that has stayed effortless. If you are going to start somewhere, this is the place.
The soil gave. The soil lost. We can give back — one mineral at a time.
Sources & Inspiration: Donald R. Davis et al., “Changes in USDA Food Composition Data for 43 Garden Crops, 1950 to 1999,” Journal of the American College of Nutrition, 2004. 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. Anne-Marie Mayer, “Historical Changes in the Mineral Content of Fruits and Vegetables,” British Food Journal, 1997. William A. Albrecht, The Albrecht Papers, Acres U.S.A., 1975–1992. Seung-Kyu Kim et al., “Widespread Occurrence of Microplastics in Sea Salt,” Environmental Science & Technology, 2018. This article is for educational purposes only and is not medical advice. Always consult your physician before changing supplements or starting a new health practice.