The Problem With Saying “Just Get It From Food”
When people talk about calcium and magnesium in drinking water, the most common response is: “You should get those minerals from food.”
In theory, that is true. Food is the primary source of both calcium and magnesium. The World Health Organization (WHO) states that food is the principal source of these minerals, with dairy products being especially important for calcium, and vegetables, grains, fruits, nuts, and dairy contributing to magnesium intake.
But the real-world picture is more complicated.
Many people do not consistently meet recommended intakes of calcium and magnesium. WHO notes that, because of food habits, many people in most countries fail to obtain recommended intakes of one or both minerals from diet alone. WHO also states that mineral-rich drinking water can provide a substantial contribution to total calcium and magnesium intake for some populations or subgroups.
So the better question is not whether food matters, it is:
Can we assume modern food always provides enough calcium and magnesium?
The evidence suggests we should be careful with that assumption.
Calcium and magnesium are essential to human health. Calcium is best known for bones and teeth, but it also plays important roles in vascular contraction, blood clotting, muscle contraction, and nerve transmission. Magnesium is involved in hundreds of enzyme reactions and supports normal vascular tone, energy metabolism, and insulin sensitivity. WHO states plainly that inadequate intake of either mineral can impair health.
The issue is not that food does not contain calcium or magnesium. It does. The issue is that many people do not consistently consume enough of the foods that supply these minerals. WHO notes that available evidence suggests many people in most countries fail to obtain recommended intakes of calcium and/or magnesium from their diets.
That alone makes water minerals relevant. Drinking water is consumed every day, often multiple times per day, and in some regions it can provide a steady background contribution of calcium and magnesium.
Are Calcium and Magnesium Levels in Food Declining?
There is evidence that some foods have shown declines in mineral density over time, although the explanation is more complex than the popular phrase “soil depletion.”
A widely cited U.S. study by Davis, Epp, and Riordan compared USDA food composition data for 43 garden crops between 1950 and 1999. The study found statistically reliable apparent declines in several nutrients, including calcium. The authors suggested the declines were most likely explained by changes in cultivated crop varieties and tradeoffs between yield and nutrient content, rather than a simple claim that all soils had become depleted.
A UK-focused study by Anne-Marie Mayer compared mineral content in fruits and vegetables from the 1930s and 1980s. It reported statistically significant reductions in calcium and magnesium in vegetables, and magnesium declines in fruit.
White and Broadley also reviewed historical variation in mineral composition of edible horticultural products using UK and U.S. food survey data. They found significant decreases in average magnesium in UK vegetables and significant decreases in average calcium in U.S. vegetables when comparing older and more recent food data.
These studies do not prove that every modern food is mineral-poor. They do show that mineral density can change over time, and that calcium and magnesium are among the minerals that have shown declines in some datasets.
The Hidden Problem: Water Treatment Can Remove the Minerals We Still Need
At the same time that food mineral intake may be inconsistent, many modern water treatment systems remove calcium and magnesium from water.
Point-of-entry (POE) softeners remove hardness minerals, including calcium and magnesium, and replace each divalent ion with two sodium ions. Reverse osmosis and distillation can remove virtually all calcium and magnesium from drinking water. WHO states that point-of-use (POU) reverse osmosis membrane systems remove almost all calcium and magnesium, and that distillers can remove virtually all inorganic chemicals, including calcium and magnesium.
This is where the problem becomes clearer: if people are already marginal in calcium or magnesium intake, and their food sources are variable, then removing naturally present calcium and magnesium from drinking water may reduce one more daily source of these minerals.
Calcium & Magnesium Are Not Optional Minerals
The Calcium and Magnesium Gap Is Not Just an Agriculture Problem
Even without historical nutrient decline, calcium and magnesium shortfalls are already common because of diet patterns. Many people do not eat enough mineral-rich foods, such as dairy, leafy greens, legumes, nuts, seeds, and whole grains. WHO notes that dietary calcium and magnesium intake varies widely across populations, and many people fall short of recommended levels.
So there are two overlapping issues:
First, some foods may contain lower concentrations of certain minerals than they once did, depending on crop, variety, growing conditions, and agricultural practices.
Second, many people do not consistently eat enough calcium- and magnesium-rich foods in the first place.
That is why drinking water minerals matter. Water is not a replacement for food, but it can be a reliable supplemental source. WHO specifically notes that mineral-rich drinking waters may contribute substantially to total calcium and magnesium intake for some groups.
Where ScaleStop TAC Comes In
ScaleStop TAC does not add calcium or magnesium to water. That is important to say clearly.
Its value is different: ScaleStop TAC helps preserve calcium and magnesium when they are already naturally present in the water.
Traditional softeners solve hardness by removing calcium and magnesium. RO and distillation can strip water even further. ScaleStop TAC takes a different approach. It does not remove calcium or magnesium, and it does not exchange them for sodium. Instead, TAC helps control how calcium carbonate behaves so it is less likely to form hard, attached scale in plumbing, heaters, and appliances.
ScaleStop TAC helps address the practical reason people remove calcium and magnesium from water — scale — without stripping those minerals out of the water.
The Minerals in Water Still Matter
Food should remain the foundation of calcium and magnesium intake. But it is no longer enough to assume that food always provides enough, or that minerals in drinking water do not matter.
The literature shows a more complicated reality: calcium and magnesium intake is often inadequate, some food sources have shown mineral-density declines, and modern water treatment can remove the very minerals that may help supplement daily intake.
ScaleStop TAC does not claim to solve nutrition. It does something more specific and practical: it helps protect plumbing and equipment from scale while allowing naturally occurring calcium and magnesium to remain in the water.
That makes TAC especially relevant in today’s mineral conversation. It supports a smarter approach to water treatment — one that recognizes calcium and magnesium as essential minerals worth preserving, not contaminants to remove by default.
Source List
- World Health Organization. Calcium and Magnesium in Drinking-water: Public Health Significance. WHO, 2009.
- Davis, D.R., Epp, M.D., and Riordan, H.D. “Changes in USDA Food Composition Data for 43 Garden Crops, 1950 to 1999.” Journal of the American College of Nutrition, 2004.
- Mayer, A.M. “Historical Changes in the Mineral Content of Fruits and Vegetables.” British Food Journal, 1997.
- White, P.J. and Broadley, M.R. “Historical Variation in the Mineral Composition of Edible Horticultural Products.” Journal of Horticultural Science & Biotechnology, 2005.
- Marles, R.J. “Mineral Nutrient Composition of Vegetables, Fruits and Grains: The Context of Reports of Apparent Historical Declines.” Journal of Food Composition and Analysis, 2017.
- Fan, M.S., Zhao, F.J., Fairweather-Tait, S.J., Poulton, P.R., Dunham, S.J., and McGrath, S.P. “Evidence of Decreasing Mineral Density in Wheat Grain Over the Last 160 Years.” Journal of Trace Elements in Medicine and Biology, 2008.
- Garvin, D.F., Welch, R.M., and Finley, J.W. “Historical Shifts in the Seed Mineral Micronutrient Concentration of U.S. Hard Red Winter Wheat Germplasm.” Journal of the Science of Food and Agriculture, 2006.
- Loladze, I. “Hidden Shift of the Ionome of Plants Exposed to Elevated CO₂ Depletes Minerals at the Base of Human Nutrition.” eLife, 2014.
- WateReuse Research Foundation. Evaluation of Alternatives to Domestic Ion Exchange Water Softeners. 2014.
