Magnesium remineralization of desalinated drinking water and residents' health outcomes: a prospective cohort baseline study
This prospective cohort baseline study characterizes the health and magnesium-exposure status of residents in a desalination-dependent Israeli community prior to planned water remineralization, revealing that magnesium supplementation is currently concentrated among older women and those with chronic conditions, thereby establishing a foundation for future longitudinal evaluation of remineralization's impact on public health.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
For decades, the world has turned to desalination to solve the problem of scarce fresh water. By forcing seawater through tiny filters, engineers can strip away salt and turn the ocean into a safe, drinkable resource. This process has become a lifeline for many nations, providing clean water to millions of people who would otherwise face drought. However, this technological miracle comes with a hidden side effect: the water that emerges from these plants is almost entirely stripped of minerals. While the water is free of harmful bacteria and salt, it also lacks essential nutrients like magnesium, a mineral that the human body needs to keep the heart beating steadily, muscles functioning, and bones strong. Scientists have long wondered if drinking water that is too pure, lacking these natural minerals, could quietly increase the risk of chronic health problems over time.
This question moves from theory to urgent reality in Israel, where more than seventy percent of the water flowing into homes now comes from desalination plants. Because the country has made such a rapid and complete switch to this source, it offers a unique opportunity to study the long-term effects of drinking mineral-poor water. Researchers noticed that in some communities relying on this water, people were beginning to take magnesium supplements on their own, often on the advice of doctors, to make up for what the tap water lacked. To understand whether this mineral deficiency was actually affecting health, a team of scientists from the Ministry of Health and the University of Haifa decided to look closely at one specific community before they changed the water supply. They chose Kibbutz Ma'agan Michael, a cooperative agricultural settlement in northern Israel that has relied almost exclusively on desalinated water for nearly twenty years.
The researchers set out to create a detailed snapshot of the community's health before any changes were made to the water. In the spring of 2025, they asked the 1,600 adult residents of the kibbutz to fill out a questionnaire about their lives, their health history, and what they ate. They wanted to know who was drinking tap water alone and who was already taking magnesium supplements. Of the people they asked, 443 residents responded, providing a clear picture of the population at that moment. The group was generally well-educated, with most holding university degrees, and the average age was fifty-one. About thirty-seven percent of the respondents said they were already taking magnesium supplements.
When the scientists compared the people who took supplements with those who did not, a clear pattern emerged. The supplement users were significantly older and more likely to be women. They were also less likely to drink alcohol and more likely to report having at least one chronic health condition, such as high blood pressure or thyroid issues. Interestingly, the study did not find a difference in the rates of heart disease or diabetes between the two groups at this stage. The researchers noted that the people taking supplements seemed to be the ones who were already more health-conscious or who had been advised by doctors to take extra minerals because of existing health concerns. This suggested that the group taking supplements was not a random cross-section of the community, but rather a specific subgroup that was already paying close attention to their health.
The study is the first step in a larger, long-term project. The researchers plan to follow these same residents for the next two years. In April 2026, the water supply for Kibbutz Ma'agan Michael will be adjusted to add magnesium back into the mix, aiming for a concentration of twenty to thirty milligrams per liter. Once this change happens, the team will measure the health of the community again at one year and two years later. By comparing the health data before and after the water is enriched, they hope to see if adding the mineral back into the water leads to measurable improvements in health outcomes.
This approach is designed to provide concrete evidence for policy makers who are trying to decide how to treat desalinated water around the world. Currently, there is no global agreement on exactly how much magnesium should be in drinking water. Some health organizations have suggested minimum levels, while others have waited for more proof. The situation in Israel, where a large population has been drinking low-mineral water for a long time, offers a rare chance to test whether adding magnesium back into the water actually helps prevent disease. The baseline data collected from Kibbutz Ma'agan Michael shows that the community is ready for this test, with a well-defined group of residents whose health can be tracked over time. If the follow-up measurements show that adding magnesium reduces health problems, it could lead to new standards for water treatment globally, ensuring that the water we drink not only quenches thirst but also supports the body's fundamental needs.
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