# Nutrition in myasthenia gravis
General nutritional needs
In myasthenia gravis, nutrition can play two roles: on one hand, nourishing the body well despite possible swallowing difficulties, on the other hand, preventing certain substances from worsening the disease.
Many patients with myasthenia gravis do not need separate dietary restrictions and eat normally. But when muscle weakness affects the throat or chewing muscles, the requirements change: thin, easily swallowed food becomes practically necessary. However, this is a logistical matter (physical meal preparation), not a medical dietary requirement.
Additionally, recent research shows that certain nutrients may play a role in how the immune system responds. We discuss what is known below.
Omega-3 fatty acids (docosahexaenoic acid / DHA)
Advised againstiProven ineffective or harmful, or dangerous in combination with your treatment
Recent research shows that docosahexaenoic acid (DHA), a commonly used omega-3 supplement, can affect the immune system in a way that is unfavorable in myasthenia gravis. In a study, patients using DHA were followed observationally and were found to have more immune activation, possibly because DHA stimulates certain immune cells that are already overactive in myasthenia gravis.
This does not mean all fats are bad, but DHA supplements appear risky for this group. Anyone considering an omega-3 supplement should discuss this beforehand with their treatment provider. DHA is found naturally mainly in fatty fish; most people do not get enough from food alone to be problematic.
Ketogenic diets
ResearchediPositive results in clinical studies, not yet standard treatment
A ketogenic diet (very low carbohydrates, high fat) was tested in a pilot study in myasthenia gravis. The researchers found indications that such a diet can lower certain inflammation markers in the blood and patients sometimes felt better.
These studies are small and preliminary. Ketogenic diets are not easy to maintain and also have side effects. For now: this is not standard treatment and requires much preparation. Anyone wishing to try this should do so under the guidance of a doctor and a dietitian, as it may entail risks.
Salt and fluid loss
Some medications used in myasthenia gravis (such as certain corticosteroids or immunosuppressants) may affect salt balance and fluid balance. However, this is medication-specific and not attributable to the diet itself.
In case of fluid retention or blood pressure shifts, the treatment provider can give guidance on salt intake. These are personal and not general to the disease.
Swallowing and food choices
ProveniIncluded in official guidelines, or approved by EMA or FDA
When myasthenia gravis weakens the muscles in the throat (dysphagia), food becomes practically more difficult. Hard, dry, or crumbly food is risky; aspiration (food in the airway) can occur.
At this stage, adapted food helps:
- **Finely ground or blended food** – easier to swallow
- **Adequate fluid** – helps swallowing
- **Lukewarm temperature** – usually better tolerated than very hot or ice cold
- **Small portions** – less effort
This is not a diet, but food logistics. A speech therapist or dietitian can help develop adapted eating schedules. Sometimes nutritional drinks (tube or drinking nutrition applications) are needed if solid food is no longer safe.
Drug interactions with food
Various medications used in myasthenia gravis can interact with food:
- **Some anticonvulsants** (used for certain symptoms) can affect vitamin absorption.
- **Corticosteroids** can increase hunger or irritate the stomach lining; regular eating can help.
- **Immunosuppressants** can cause digestive upset; adapting food to what is well tolerated helps.
However, these are medication-specific matters, not something you can read for yourself from a package. The pharmacist and doctor can explain this for each individual.
Vitamin status
Patients with myasthenia gravis have no special vitamin requirements *because* they have myasthenia gravis. However, long-term use of certain medications (especially certain immunosuppressants or corticosteroids) can affect folate, calcium, or vitamin D over time.
Whether someone needs additional vitamins depends on:
- Which medications are used exactly
- How well the immune system absorbs nutrients
- Dietary restrictions due to swallowing difficulties
- Individual blood values
The doctor or dietitian determines this based on your situation. Self-supplementation is not recommended without discussing this first.
Microbiome and immune system
ResearchediPositive results in clinical studies, not yet standard treatment
There is growing research into how gut bacteria (microbiome) and immune defense work together in autoimmune diseases such as myasthenia gravis. Diet partly determines what kind of bacteria grow in the gut.
To date, there are no concrete dietary recommendations based on this for myasthenia gravis. This is a rapidly growing area of research, but patients cannot start with this on their own – it requires research and guidance.
Nutrition during treatment
When treatment begins (immunosuppressants, plasma exchange, or other interventions), nutrition can temporarily become more difficult:
- After plasma exchange, appetite can decrease
- Certain medications cause nausea
- Timing of eating and medication intake can matter
The treating physician and dietitian help with practical tips. This is temporary and requires flexibility, not a structural diet.
Practical recommendations
For most patients: **eat what you tolerate well and what your body needs**. No food is inherently "bad" for myasthenia gravis per se.
However, be aware:
- **Avoid DHA supplements** without first consulting your doctor
- **Pay attention to swallowing ease** – adapt food to what is safe
- **Consult about vitamin status** during long-term medication use
- **Discuss new diets** (such as ketogenic) with your team beforehand
For personal dietary choices, dietary adjustments, or supplement questions: speak to your **dietitian or treating physician**. They know your medications, your symptoms, and your lab results.
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_This information never replaces a doctor's judgment. Always discuss your situation with your own healthcare provider._