What Do We Know Right Now About Magnesium and Gut Health?
There are two things I never get tired of talking about…
Poop, and magnesium intake.
But does one have anything to do with the other?
That question is not as straightforward to answer as you might think.
In today’s article, I will explore why magnesium is such a popular mineral and help you understand what—if any—role it has to play in digestive health.
Let’s get right to it.
Magnesium – The Most Popular Mineral?
If not, it’s certainly up there—or it should be.
A quick glance at top-selling supplements shows that magnesium consistently appears on consumers’ radar, and population-level data suggest that intake is often suboptimal.
In fact, a 2018 paper in Open Heart described inadequate magnesium intake as a potential contributor to the risk of chronic disease and a public health concern.
Given magnesium’s role in blood pressure regulation—and how common high blood pressure is—this connection is not surprising. Higher magnesium intake has also been associated with reduced risk of stroke and type 2 diabetes.
The challenge? Magnesium is most abundant in foods that are often under-consumed:
- Leafy greens (chard, kale, spinach)
- Seeds (pumpkin, flax, hemp)
- Legumes (chickpeas, lentils, beans)
- Nuts (almonds, cashews, walnuts)
- Whole grains (brown rice, quinoa)
These foods are also rich in fiber—making them important for gut health, but they can be tricky for individuals with Irritable Bowel Syndrome, depending on tolerance.
As a dietitian, that’s difficult to digest.
But does a lack of magnesium mean your digestion will be off, too? Let’s take a closer look.
Magnesium & Gut Health
The connection between magnesium (both dietary and supplemental) and gut health is not always straightforward, but there are a few key areas worth understanding.
Consideration #1 – Magnesium Oxide & Constipation
Magnesium oxide is a supplemental form of magnesium that has been used for decades—particularly in Japan—as a safe and low-cost option for managing constipation.
Low magnesium intake has been associated with increased risk of constipation, possibly due to its role in muscle relaxation and fluid balance in the digestive tract.
A randomized controlled trial in women with mild-to-moderate constipation found that magnesium oxide supplementation improved stool consistency and reduced colon transit time.
Guidelines from the American College of Gastroenterology note that magnesium-based products have moderate evidence supporting their use as over-the-counter aids for constipation. However, certain populations—including older adults, those with kidney disease, or individuals on multiple medications—should use caution.
It’s also important to note that there is still insufficient evidence to make strong recommendations for magnesium supplementation specifically in IBS-C, though it remains an area of growing interest.
Consideration #2 – Magnesium & GERD
There are also some interesting connections between magnesium and Gastroesophageal Reflux Disease.
A study published in the British Journal of Nutrition found that higher dietary magnesium intake was associated with a lower risk of esophagitis and Barrett’s Esophagus—conditions that can occur in individuals with chronic GERD.
Another important consideration is medication use. Proton pump inhibitors (PPIs), commonly prescribed for GERD, may reduce magnesium absorption—especially with long-term or high-dose use.
This means individuals managing reflux with PPIs may benefit from monitoring their magnesium intake and status over time.
Final Thoughts
Magnesium intake and supplementation continue to be areas of growing interest in both public health and digestive health research.
Magnesium-rich foods offer a combination of benefits—supporting cardiovascular health, metabolic function, and gut motility. At the same time, their fiber content means they may need to be approached thoughtfully for individuals with IBS or other digestive sensitivities.
Supplementation may play a role in certain situations, particularly for constipation or in cases of deficiency, but it is not a one-size-fits-all solution.
As always, the goal is to find the balance that works best for your body—supporting both digestive comfort and overall health.
- Dai, Q., Cantwell, M. M., Murray, L. J., Zheng, W., Anderson, L. A., & Coleman, H. G. (2016). Dietary magnesium, calcium: magnesium ratio and risk of reflux oesophagitis, Barrett’s oesophagus and oesophageal adenocarcinoma: a population-based case–control study. British Journal of Nutrition, 115(2), 342–350. https://doi:10.1017/S0007114515004444
- DiNicolantonio, J. J., O’Keefe, J. H., & Wilson, W. (2018). Subclinical magnesium deficiency: A principal driver of cardiovascular disease and a public health crisis. Open Heart, 5(1), e000668. https://doi.org/10.1136/openhrt-2017-000668
- Fang, X., Wang, K., Han, D., He, X., Wei, J., Zhao, L., & Wang, F. (2016). Dietary magnesium intake and the risk of stroke: A dose-response meta-analysis of prospective cohort studies. Journal of the American Heart Association, 5(11), e003918. https://doi.org/10.1161/JAHA.116.003918
- Mori, S., Tomita, T., Fujimura, K., Asano, H., Ogawa, T., Yamasaki, T., Kondo, T., Kono, T., Tozawa, K., Oshima, T., Fukui, H., Kimura, T., Watari, J., & Miwa, H. (2019). A Randomized Double-blind Placebo-controlled Trial on the Effect of Magnesium Oxide in Patients With Chronic Constipation. Journal of neurogastroenterology and motility, 25(4), 563–575. https://doi.org/10.5056/jnm18194
- Park, C. H., Kim, E. H., Roh, Y. H., Kim, H. Y., & Lee, S. K. (2014). The association between the use of proton pump inhibitors and the risk of hypomagnesemia: A systematic review and meta-analysis. PLoS ONE, 9(11), e112558. https://doi.org/10.1371/journal.pone.0112558
- Rao, S. S. C., & Brenner, D. M. (2021). Efficacy and Safety of Over-the-Counter Therapies for Chronic Constipation: An Updated Systematic Review. The American journal of gastroenterology, 116(6), 1156–1181. https://doi.org/10.14309/ajg.0000000000001222
- Rosanoff, A., Weaver, C. M., & Rude, R. K. (2012). Suboptimal magnesium status in the United States: Are the health consequences underestimated? Nutrition Reviews, 70(3), 153–164. https://doi.org/10.1111/j.1753-4887.2011.00465.x
- Zhang, X., Li, Y., Del Gobbo, L. C., Rosanoff, A., Wang, J., Zhang, W., & Song, Y. (2016). Effects of Magnesium Supplementation on Blood Pressure: A Meta-Analysis of Randomized Double-Blind Placebo-Controlled Trials. Hypertension (Dallas, Tex. : 1979), 68(2), 324–333. https://doi.org/10.1161/HYPERTENSIONAHA.116.07664
Recipes
Products
Comments
Join The Conversation...