Myalgic encephalomyelitis, also called chronic fatigue syndrome (ME/CFS), is a long-term condition that affects multiple body systems. Its defining feature is not ordinary tiredness but a substantial reduction in the ability to carry out previous activities, accompanied by symptoms that worsen after physical, cognitive, emotional or social exertion. This delayed deterioration is called post-exertional malaise.
Unrefreshing sleep, cognitive difficulty, pain, headaches, dizziness or palpitations when upright, and sensitivity to light or sound are also common. Symptoms fluctuate and range from mild to very severe. ME/CFS is not simply depression, although living with a disabling illness can understandably affect mental health.
Diagnosis and management
There is no single diagnostic test. Clinical assessment and investigations are used to exclude other explanations such as anaemia, thyroid disease, sleep disorders, infection or inflammatory illness. New chest pain, fainting, marked neurological change or rapidly worsening symptoms should not automatically be attributed to ME/CFS.
Management is individual. Energy management aims to establish a sustainable pattern of activity and rest without provoking symptom deterioration. Graded exercise therapy, in which activity is increased according to a fixed schedule, is not recommended. Any movement plan should remain flexible, stay within the person’s energy limits and be supported by a professional familiar with ME/CFS.
Sleep, pain, orthostatic symptoms and practical support may each need separate attention. Cognitive behavioural therapy may help someone cope with a long-term condition but is not a cure and should not imply that symptoms are caused by faulty beliefs.
Food and daily living
Regular, balanced meals support energy and nutritional adequacy. Severe illness may make shopping, preparation, chewing or swallowing difficult, in which case dietetic help is appropriate. Large elimination diets are not routinely recommended and can increase malnutrition risk.
Simple adaptations—prepared ingredients, seated food preparation, accessible snacks and accepting help—may conserve limited energy. Fluids and salt require individual advice, particularly where orthostatic intolerance, kidney disease, heart disease or high blood pressure is present.
Useful supplements
Supplements should be selected for the individual rather than used automatically. Product directions and advice from an appropriately qualified professional should take precedence over general information.
| Supplement | Effects |
|---|---|
| Coenzyme Q10 | Participates in mitochondrial energy production and antioxidant protection. Evidence for meaningful benefit in ME/CFS remains insufficient. |
| Vitamin B6 as pyridoxal-5-phosphate | Supports energy metabolism, nervous-system function and magnesium utilisation. Long-term high doses can cause peripheral neuropathy. |
| Magnesium citrate | Contributes to energy production and normal muscle and nerve function. It may be relevant when intake or status is low but can cause diarrhoea. |
| Vitamin B5 (pantothenate) | Supports normal energy metabolism and steroid-hormone synthesis; deficiency is uncommon. |
| Krill oil or marine fish oil | Provides omega-3 fats used by the nervous system and involved in anti-inflammatory signalling. Evidence in ME/CFS is limited. |
| Vitamin C | Supports antioxidant defences, connective tissue and normal immune function. High doses have not been shown to treat ME/CFS. |
| A broad-spectrum probiotic | Supports intestinal microbial balance. It may help particular digestive symptoms, but does not have established disease-modifying effects. |
| Vitamin D3 | Corrects deficiency and supports bone, muscle and immune function. Testing can guide appropriate dosing. |
| A multivitamin and mineral formula containing B vitamins, magnesium, zinc and selenium | Helps cover broad dietary gaps when intake is restricted or food preparation is difficult. |
| Spirulina | Provides concentrated nutrients and antioxidant pigments; claims that it “alkalises” the body are not physiologically accurate. |
| Broad-spectrum digestive enzymes | Assist food breakdown but have not been shown to treat ME/CFS or improve nutrient absorption in people without enzyme insufficiency. |
| Hop alpha acids | Have anti-inflammatory properties and may help pain, although clinical evidence is limited and interactions should be checked. |
NICE notes that evidence is insufficient to recommend supplements such as vitamin B12, vitamin C, magnesium or CoQ10 as ME/CFS treatments. Introduce only one carefully chosen product at a time, with realistic expectations.
Looking for personalised nutrition and lifestyle support? An FNTP member may be able to help you explore an approach suited to your individual needs. Find an FNTP practitioner.
This article is for general education and does not replace individual medical advice, diagnosis or treatment.
