Keto diet may be a powerful new tool for fighting gMG muscle weakness

A high-fat, low-carbohydrate ketogenic diet may significantly reduce muscle weakness and fatigue for people living with generalized myasthenia gravis (gMG), according to a new pilot clinical trial. Patients who followed the “keto” regimen for 12 weeks saw clinically meaningful improvements in their physical symptoms compared to those who stuck to their regular eating habits.

Beyond physical strength, the study found that the diet helped regulate the immune system by increasing the number of regulatory T-cells, which help prevent the body from attacking itself. Researchers also noted a drop in markers of body-wide inflammation, suggesting that altering how the body fuels itself could be a powerful tool for managing the autoimmune disorder.

The findings, published in the Journal of Autoimmunity, mark the first time a controlled dietary intervention has been tested specifically for myasthenia gravis (MG). Researchers at Charité-University of Berlin in Germany wrote that this type of “metabolic modulation” offers a promising strategy to complement existing medical treatments.

“This study provides exploratory evidence that ketogenic dietary interventions may beneficially influence disease activity, fatigue and immune regulation in MG,” they wrote in “Impact of a ketogenic diet on clinical outcomes and immunological markers in myasthenia gravis: A randomized pilot study.”

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How the ketogenic diet works

MG is typically caused by self-reactive antibodies that disrupt communication between nerves and muscles. This leads to the hallmark symptoms of severe muscle weakness and exhaustion. In the generalized form of the disease, these symptoms affect multiple muscle groups throughout the body.

The keto diet works by shifting the body’s primary energy source. Instead of burning glucose derived from carbohydrates, the body begins to burn ketone bodies — fat-derived molecules produced by the liver to serve as an energy source when glucose is not readily available. This metabolic shift has already been shown to reduce inflammation and improve quality of life in other neuroimmune conditions, such as multiple sclerosis, where it has been reported to lessen fatigue and improve quality of life..

To see if these benefits applied to MG, the research team recruited 41 adults with generalized MG for a 12-week pilot study (DRKS00032686). Twenty patients were assigned to a strict ketogenic diet consisting of roughly 75% fat, 20% protein, and 5% carbohydrates, while the remaining 21 patients continued their usual diet. Most participants were women around the age of 50 who had lived with the disease for a median of 3.5 years and tested positive for anti-AChR antibodies.

“To our knowledge, no controlled interventional dietary study has been conducted in MG to date, although dietary manipulation has been increasingly recognized as a potential immunometabolic modulator in autoimmune disease,” the researchers wrote.

By the end of the trial, 80% of those in the keto group expressed a willingness to continue the diet, despite one person dropping out due to nausea. The results showed a clear distinction between the two groups: while the control group’s symptoms remained stable or slightly worsened, the keto group experienced significant relief.

Meaningful improvements in fatigue and weakness

The most striking results were found in muscle function and energy levels. Patients on the keto diet showed a two-point drop on the Myasthenia Gravis Activities of Daily Living (MG-ADL) scale and a three-point drop in muscle weakness severity. Both of these changes are considered “clinically meaningful” by medical standards.

Fatigue levels saw an even more dramatic shift, with a four-point reduction in severity scores. Meanwhile, the control group saw almost no change in their fatigue. Additionally, the keto group showed a decrease in body mass index, a ratio of weight and height used as a proxy for body fat, and lower levels of calprotectin, a protein marker of systemic inflammation.

Participants on the keto diet tended to have less severe disease after 12 weeks, according to the Myasthenia Gravis Foundation of America classification system. Other measures of symptoms and quality of life “remained largely unchanged in the intervention group but worsened in controls,” the researchers wrote.

The scientists emphasized that the increase in regulatory T-cells in the keto group is particularly significant. These cells help the immune system remain balanced and prevent the overactive responses that drive autoimmune diseases.

While the study was a small pilot, the results suggest that what a patient eats could directly influence their objective muscle function and how they feel on a daily basis. The team concluded that the ketogenic diet may beneficially influence the overall disease burden, offering a new, non-drug-based way to help manage gMG.