Intermittent Fasting and Autoimmune Diseases: New Data and Prospects

Introduction: What Are Intermittent Fasting and Autoimmune Diseases?

Intermittent fasting (IF) is a dietary regimen that alternates periods of eating with periods of voluntary abstinence from food. Traditionally, IF has been viewed as a strategy for weight loss and improving metabolic health [1]. However, recent studies are beginning to reveal its potential in a broader context, including its impact on autoimmune diseases (ADs).

Autoimmune diseases are a group of conditions in which the body's immune system mistakenly attacks its own healthy tissues, perceiving them as foreign. These conditions can affect virtually any part of the body and are often characterized by chronic inflammation. Examples include type 1 diabetes mellitus, rheumatoid arthritis, systemic lupus erythematosus, and autoimmune thyroid diseases [1, 8].

Mechanisms of Action of Intermittent Fasting in Autoimmune Diseases

Studies show that intermittent fasting may exert a beneficial effect on the course of autoimmune diseases through several key mechanisms [1]:

• Reduction of inflammatory markers: IF helps decrease the levels of pro-inflammatory cytokines, such as interleukin-6 (IL-6) and tumor necrosis factor-alpha (TNF-α), which are often elevated in autoimmune conditions [1, 8]. Reducing inflammation is critical for easing symptoms and slowing the progression of ADs.
• Modulation of the immune system: Periods of fasting can influence immune cell activity, helping to restore balance and reduce immune autoaggression [1]. This may include altering the ratio of various lymphocyte types and their functions.
• Modification and improvement of the gut microbiota: The gut microbiota plays a significant role in the development and modulation of immune responses. IF is capable of altering the composition of the gut microbiota, promoting the growth of beneficial bacteria and reducing the number of those associated with inflammation and autoimmunity [1, 4]. Disruptions in the gut microbiota are observed in many ADs [4].
• Enhanced cellular repair via autophagy: Autophagy is the natural process of recycling damaged cell components and regenerating them. Intermittent fasting activates autophagy, which facilitates the removal of defective proteins and organelles, improving cellular health and reducing cellular stress that can contribute to the development of autoimmune reactions [1].

Potential Benefits for Specific Autoimmune Diseases

Although research is ongoing, there is already data indicating the potential benefit of intermittent fasting in certain autoimmune conditions [1]:

• Type 1 diabetes mellitus (T1D): IF may help manage glucose levels and improve metabolic parameters, which is especially important for patients with T1D who experience insulin deficiency [1, 7]. It is also worth noting that T1D frequently coexists with other ADs, such as autoimmune gastritis and thyroid diseases [6].
• Rheumatoid arthritis (RA): The reduction in inflammation achieved through IF can ease joint pain and stiffness characteristic of RA [1].
• Systemic lupus erythematosus (SLE): IF may help reduce systemic inflammation and modulate the immune response, which is potentially beneficial in SLE [1].
• Autoimmune thyroid diseases (AITD): Patients with AITD often face disturbances in glucose-lipid metabolism, increased insulin resistance, and elevated levels of inflammatory factors [8]. IF can help improve these metabolic parameters and reduce inflammation. For example, insulin autoimmune syndrome may be associated with Hashimoto's thyroiditis [2].

It is important to note that evidence regarding the effect of intermittent fasting on other autoimmune diseases, such as multiple sclerosis, is still limited and requires further study [1]. Autoimmune conditions can be complex and manifest in various forms; for instance, autoimmune encephalitis can be combined with autoimmune gastritis [5].

Connection to Metabolic Health and Gut Microbiota

Intermittent fasting is known for its positive effects on metabolic health. It promotes weight loss, improves insulin sensitivity, and normalizes blood lipid levels [1]. These aspects are particularly relevant because many patients with autoimmune diseases, such as autoimmune thyroiditis, frequently demonstrate disturbances in glucose-lipid metabolism and increased insulin resistance [8]. Improving the metabolic profile can indirectly help reduce the activity of the autoimmune process.

Furthermore, the profound connection between the gut microbiota and the immune system is a key factor in the development of autoimmune diseases. Studies show that individuals with ADs exhibit specific changes in gut microbiota composition compared to healthy individuals [4]. Intermittent fasting, by altering dietary patterns, can positively influence the balance of microorganisms in the gut, helping to create a healthier environment. This, in turn, can support the immune system and reduce systemic inflammation, playing an important role in managing autoimmune conditions [1].

Important Aspects and Precautions

Despite promising results, it is important to approach intermittent fasting in autoimmune diseases with caution. Autoimmune diseases are often characterized by a complex course and may be accompanied by various comorbid conditions. For example, autoimmune gastritis can develop in patients with type 1 diabetes mellitus and autoimmune thyroid diseases, emphasizing the need for a comprehensive approach [6].

Before starting any intermittent fasting regimen, especially in the presence of chronic diseases, it is crucial to consult your attending physician or nutritionist. A specialist will be able to assess your current health status, take into account any comorbid conditions and medications you are taking, and help develop a safe and effective dietary plan tailored to your individual needs. Self-treatment can be dangerous and lead to undesirable consequences.

Conclusion

Intermittent fasting represents a promising dietary intervention that may offer additional benefits for individuals with autoimmune diseases. Its ability to reduce inflammation, modulate the immune response, improve gut microbiota, and activate cellular repair makes it an interesting subject for further research [1]. However, given the complexity of autoimmune conditions and the individual characteristics of each patient, IF should be viewed as part of comprehensive therapy and always conducted under strict medical supervision.

Sources

• [1] Intermittent fasting: A promising dietary intervention for autoimmune diseases. https://pubmed.ncbi.nlm.nih.gov/37572827/
• [2] Insulin Autoimmune Syndrome Associated With Hashimoto Thyroiditis and Nodular Thyroid Disease: Clinical Management With Flash Glucose Monitoring and Prednisolone Therapy. https://pubmed.ncbi.nlm.nih.gov/41697927/
• [3] Timing, Composition, and Clinical Correlates of Immunotherapy Response in GAD65 Antibody-Associated Epilepsy: A Literature-Derived Patient-Level Analysis of 375 Published Cases. https://pubmed.ncbi.nlm.nih.gov/42347129/
• [4] Comparative Analysis of Gut Microbiota Patterns in Irritable Bowel Syndrome, Anxiety, and Autoimmune Disorders. https://pubmed.ncbi.nlm.nih.gov/42193332/
• [5] A case of autoimmune encephalitis with autoimmune gastritis presenting as refractory hyponatremia. https://pubmed.ncbi.nlm.nih.gov/42087100/
• [6] Significance of an Early Diagnosis of Autoimmune Gastritis in Nonelderly Patients with Type 1 Diabetes Mellitus and Autoimmune Thyroid Disease. https://pubmed.ncbi.nlm.nih.gov/39971298/
• [7] Acute-onset autoimmune type 1 diabetes presenting with diabetic ketoacidosis in an obese adult. https://pubmed.ncbi.nlm.nih.gov/42658174/
• [8] Changes in glucose-lipid metabolism, insulin resistance, and inflammatory factors in patients with autoimmune thyroid disease. https://pubmed.ncbi.nlm.nih.gov/31350776/

Disclaimer: The information presented in this article is for informational purposes only and is not intended to diagnose, treat, or prevent any diseases. It does not replace professional medical advice, diagnosis, or treatment. Always consult your physician or another qualified healthcare provider with any questions regarding your health or medical condition.