TL;DR:
Magnesium plays a key role in blood sugar control, but insulin resistance and diabetes increase magnesium loss in the body. Research shows magnesium supplementation can improve HbA1c, lipid levels, inflammation, and may help prevent the progression from prediabetes to diabetes. Magnesium may also support healthier outcomes in gestational diabetes.
Magnesium, Sugar, and Blood Sugar Problems
The average American eats about 200 pounds of sugar each year. Not surprisingly, problems with blood sugar are extremely common. About 9.4% of Americans (34 million people) have diabetes, and nearly 1 in 4 people with diabetes don’t know they have it. Even more concerning, only about 11% of adults with prediabetes are aware of the problem.
Magnesium plays an important role in blood sugar control, but insulin resistance makes magnesium deficiency more likely. Research shows that insulin resistance and the high insulin levels seen in type 2 diabetes interfere with magnesium absorption and retention in the body [1]. This means that people with blood sugar problems may lose magnesium more easily—often without realizing it.
If someone eats a lot of sugar or refined carbohydrates, is overweight, or has insulin resistance or diabetes, their magnesium needs may be higher. Because so many people fall into these categories, magnesium deficiency may affect a very large portion of the population.
Magnesium and Blood Sugar Control
Magnesium’s role in blood sugar balance has been widely studied. In one clinical trial, adults with type 2 diabetes were given either 250 mg of elemental magnesium per day or a placebo. After three months, the magnesium group showed a significant improvement in HbA1c, a marker of long-term blood sugar control [2].
Other studies have found that magnesium supplementation may also improve cholesterol and triglyceride levels in people with type 2 diabetes [3]. Higher magnesium intake has been linked with a lower risk of progressing from prediabetes to diabetes [4].
Low magnesium levels may also contribute to diabetes-related nerve damage. Research has found that people with diabetic polyneuropathy often have low magnesium levels inside red blood cells, suggesting long-term deficiency [4].
Gestational Diabetes
Magnesium may also be helpful for women with gestational diabetes. In one study, magnesium supplementation for six weeks was associated with reduced inflammatory markers and improved gene expression related to metabolic health. The authors concluded that magnesium supplementation may help reduce metabolic complications in women with gestational diabetes [5].
Another study found that magnesium, when combined with vitamin E, improved blood sugar control and lipid levels in women with gestational diabetes, although HDL (“good”) cholesterol did not change significantly [6].
Why This Matters
Blood sugar problems and magnesium deficiency often occur together and may reinforce each other. Because magnesium supports insulin function, inflammation control, and metabolic health, maintaining adequate magnesium intake may be an important part of supporting healthy blood sugar—especially in people with insulin resistance or diabetes.
FAQ
How does magnesium affect blood sugar?
Magnesium helps insulin work properly and supports the enzymes involved in glucose metabolism. Low magnesium can worsen insulin resistance, making blood sugar harder to control.
Why are people with diabetes often low in magnesium?
Insulin resistance and high insulin levels interfere with magnesium absorption and increase magnesium loss through the kidneys. This creates a cycle where blood sugar problems and magnesium deficiency reinforce each other [1].
Can magnesium improve HbA1c?
Yes. Clinical studies have shown that magnesium supplementation can significantly improve HbA1c levels in people with type 2 diabetes [2].
Does magnesium help with cholesterol and triglycerides?
Research suggests magnesium supplementation may improve cholesterol and triglyceride levels in people with type 2 diabetes, likely by improving overall metabolic function [3].
Can magnesium help prevent diabetes?
Higher magnesium intake has been associated with a lower risk of progressing from prediabetes to type 2 diabetes [4].
What about nerve damage in diabetes?
Low magnesium levels have been linked with diabetic neuropathy. Studies show that people with diabetes-related nerve damage often have low magnesium levels inside red blood cells [4].
Is magnesium helpful in gestational diabetes?
Studies suggest magnesium supplementation may reduce inflammation and improve blood sugar control in women with gestational diabetes, especially when combined with other nutrients such as vitamin E [5,6].
Is magnesium safe to use?
Magnesium is generally well tolerated when used appropriately. People with kidney disease or complex medical conditions should consult a doctor trained in natural healthcare before supplementing.
- J Clin Endocrinol Metab. 1995 Apr;80(4):1376-81 Effects of insulin on plasma magnesium in noninsulin-dependent diabetes mellitus: evidence for insulin resistance
- 2018 Dec 26;11(1):44 The Effects of Oral Magnesium Supplementation on Glycemic Response among Type 2 Diabetes Patients
- Magnes Res. 1994 Mar;7(1):43-7 Effects of oral magnesium supplementation on plasma lipid concentrations in patients with non-insulin-dependent diabetes mellitus
- Diabetes Care. 2014 Feb;37(2):419-27 Higher magnesium intake reduces risk of impaired glucose and insulin metabolism and progression from prediabetes to diabetes in middle-aged americans
- (Magnes Res. 2018 Nov 1;31(4):131-142) The effects of magnesium supplementation on gene expression related to inflammatory markers, vascular endothelial growth factor, and pregnancy outcomes in patients with gestational diabetes
