Fibromyalgia (FM) is a central sensitization syndrome characterized by: widespread and chronic musculoskeletal pain (lasting at least 3 months), generalized hyperalgesia (reduced pain threshold throughout the body), chronic fatigue, non-restorative sleep disturbances, cognitive impairment ("fibrofog"), and often comorbidity with irritable bowel syndrome (IBS), tension headaches, and anxiety or mood disorders. It affects approximately 2-4% of the Italian population, with a prevalence 7-9 times higher in women. The pathophysiology is complex and not fully understood: the main theory is "central sensitization" with amplification of pain signals in the central nervous system. It is not an inflammatory disease in the classical sense (there are no elevated inflammatory markers in the blood), but research shows a role for low-grade inflammation and intestinal dysbiosis. Diet in FM is not an established therapy with strong evidence, but some dietary approaches show benefits for specific symptoms in preliminary studies.

The Gut Microbiome and Fibromyalgia

One of the most interesting developments in FM research is the discovery of significant alterations in the gut microbiome. The Minerbi et al. study (Pain, 2019): analyzing the fecal microbiome of 77 women with FM versus controls, the authors identified significant differences in microbial composition that correlate with symptom severity. Some bacterial species produce serotonin, dopamine, and GABA (neurotransmitters that modulate pain and mood): their reduction in the microbiome of FM patients may contribute to central sensitization. Diet and microbiome in FM: increasing intestinal microbial diversity through diet is one of the emerging therapeutic goals. Strategies: fermented foods (kefir, yogurt, kimchi, tempeh: increase the presence of beneficial bacteria), prebiotic fibers (inulin, FOS: nourish beneficial bacteria), reduction of ultra-processed foods (the Western diet rich in sugars, trans fats, and additives reduces microbial diversity), reduced alcohol consumption (alcohol negatively alters the microbiome), elimination of foods to which one is intolerant (not allergic: simple intolerances that cause low-grade intestinal inflammation). Current evidence does not yet support a standardized dietary protocol for FM based on the microbiome: but the direction of research is promising.

Dietary Strategies with Preliminary Evidence in FM

Antioxidant and anti-inflammatory diet: a study by Slim et al. (2017, 38 patients) on a diet rich in antioxidants (fruits, vegetables, extra virgin olive oil, fish) in FM shows improvement in pain (-20%), fatigue, and sleep quality in 8 weeks versus normal diet. The Mediterranean diet for FM: adherence to the Mediterranean diet is associated with lower FM severity in observational studies (not RCTs). Raw vegan diet: one study (Hanninen et al., 2000, small): some FM patients on a raw vegan diet report improvement in pain and stiffness. However, the study design was weak and the regimen very difficult to maintain. Reduction of dietary excitotoxicity (low-excitotoxin diet): some researchers (especially Russell and Smith, 2001-2009) have proposed that flavor enhancers (MSG, monosodium glutamate, E621) and aspartame sweetener (E951) may exacerbate FM symptoms by amplifying pain signals at NMDA receptors. Studies have been small and inconclusive, but some patients report improvement by removing MSG and aspartame. Reduction of ultra-processed foods containing additives is nonetheless recommended regardless of FM. Vitamin D: deficiency is very common in people with FM. Supplementation leads to pain improvement in patients with low levels (below 30 ng/mL) in some studies. Magnesium: magnesium deficiency (common with the Western diet: refinement, chronic stress) can worsen pain sensitivity. Supplementation (magnesium glycinate or citrate: 300-400 mg/day) is sometimes recommended in FM with documented deficiency or strong dietary Mg deficit.

Physical Exercise in Fibromyalgia: The Best "Medicine"

Diet in FM must always be integrated with physical exercise, which has the strongest evidence of efficacy among all non-pharmacological treatments for FM. The Cochrane meta-analysis (Bidonde et al., 2017, 60+ studies): moderate-intensity aerobic exercise is the treatment with the strongest evidence for reducing pain, fatigue, and improving well-being in FM. Why exercise helps: regular aerobic activity increases pain threshold through the release of endorphins and endocannabinoids, improves sleep (non-restorative sleep in FM is a pain amplifier), reduces low-grade systemic inflammation, improves mood (depression and FM have high co-occurrence). Which exercise for FM: start very gradually (overload causes flares: the most common mistake FM patients make at the beginning), prefer water-based activities (heated pool 32-34°C: the thermal effect of heat reduces muscle pain, water supports body weight), walk 20-30 minutes daily (5 days a week: the simplest and most effective protocol), yoga and tai chi for FM: positive evidence in several meta-analyses for pain and well-being.

Managing FM with an Integrated Approach

FM requires a multidisciplinary approach. Treatment components with the best evidence: pharmacological: duloxetine (SNRI antidepressant), pregabalin (anticonvulsant), low-dose amitriptyline (improves non-restorative sleep). Non-pharmacological: cognitive-behavioral therapy (CBT: reduces pain catastrophizing and improves coping), aerobic physical exercise (the strongest evidence), sleep hygiene (fundamental: non-restorative sleep amplifies pain), stress management (biofeedback, mindfulness, yoga). Diet: as a complement to main treatment. Not as an alternative to medications or psychotherapy. In Italy, reference centers for FM: rheumatologists and physiatrists have the greatest clinical expertise. There is not yet a dedicated care pathway for FM in the national health system (unlike other European countries): many patients struggle to obtain a diagnosis and appropriate care. Italian associations: AISF (Italian Fibromyalgia Syndrome Association, fibromialgiaitaliana.it) offers support, information, and self-help groups. The fight for recognition of FM as a chronic disabling disease for the purpose of national health system benefits is still ongoing in Italy.