Living With Arthritis
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Diet for ankylosing spondylitis

There's no specific AS diet, but a Mediterranean eating pattern supports inflammation control, bone health (a concern with long-term AS), and a healthy weight so the spine and hips carry less load.

Foods to favour

  • Oily fish for omega-3s
  • Olive oil as the main cooking fat
  • Wide variety of vegetables and fruit
  • Wholegrains, pulses, and seeds
  • Calcium and vitamin D for bone health

Foods to limit

  • Ultra-processed foods
  • Excess sugar and refined carbohydrates
  • Excess alcohol
  • Foods that personally appear to trigger your symptoms

Bone health is part of the AS diet conversation

Reduced mobility, inflammation and, for some people, steroid exposure raise osteoporosis risk. Calcium-rich foods or fortified alternatives, vitamin D (especially in UK winter), and not skipping protein at breakfast matter as much as 'anti-inflammatory' branding on a yoghurt pot. If you have been on long-term steroids or have had a fragility fracture, ask about a DEXA scan rather than guessing from diet alone.

Weight, alcohol and gut overlap

Extra weight loads the hips and lumbar spine and makes exercise harder — the one treatment AS cannot skip. Alcohol adds empty calories and can worsen sleep, which already suffers when night pain wakes you. Some people with axial SpA also have inflammatory bowel disease; if diarrhoea, blood or unexplained weight loss appear, that is a gastroenterology question, not a reason to start a restrictive 'AS protocol' diet from social media.

Supplements with honest evidence

Omega-3 fish oil has the most consistent supportive data for inflammatory arthritis in general; vitamin D should be replaced if you are deficient. There is no robust evidence that cutting all starch, going gluten-free without coeliac disease, or taking high-dose turmeric replaces NSAIDs or biologics. Tell your pharmacist about any supplement if you take methotrexate, warfarin or a biologic.

This is general information, not a substitute for personalised medical advice.

Frequently asked questions

What is the best diet for ankylosing spondylitis?

There is no AS-specific diet. A Mediterranean pattern — vegetables, oily fish, olive oil, pulses, modest alcohol — supports inflammation control, weight and bone health. It sits beside daily exercise and prescribed medicine.

What foods should I avoid with AS?

Limit ultra-processed food, excess sugar and heavy drinking. There is no strong evidence that cutting all starch or going gluten-free helps unless you have coeliac disease. Watch for personal gut triggers if you also have IBD symptoms.

Can diet reduce AS inflammation?

A healthy eating pattern and a healthy weight help overall inflammation and make exercise easier. Diet will not replace NSAIDs or biologics when MRI or bloods show active axial disease.

Do supplements help ankylosing spondylitis?

Replace vitamin D if you are deficient. Omega-3 has the most consistent supportive data for inflammatory arthritis in general. Tell your pharmacist about high-dose turmeric or herbal mixes if you take other medicines.

Why does AS diet advice mention bones?

Reduced mobility, inflammation and sometimes steroids raise osteoporosis risk. Calcium-rich foods or fortified alternatives, vitamin D in UK winter, and resistance exercise matter as much as 'anti-inflammatory' marketing.