Arthritis Psoriatic Arthritis 3 Diets That May Help Prevent or Treat Psoriatic Arthritis While scientific evidence is lacking, many say diet changes help By Carol Eustice Carol Eustice Verywell Health's Facebook Carol Eustice is a writer covering arthritis and chronic illness, who herself has been diagnosed with both rheumatoid arthritis and osteoarthritis. Learn about our editorial process Updated on July 26, 2022 Medically reviewed by David Ozeri, MD Medically reviewed by David Ozeri, MD Verywell Health's LinkedIn David Ozeri, MD, is a board-certified rheumatologist. He is based in Tel Aviv, Israel, where he does research at Sheba Medical Center. Previously, he practiced at New York-Presbyterian Hospital. Learn about our Medical Expert Board Print Let's start with the bottom line: Changing your diet will not cure psoriatic arthritis. And according to the National Psoriasis Foundation, there is little evidence to suggest that dietary changes will make much difference to your psoriatic disease at all. With that being said, there are people living with the disease who claim that eating a low-calorie, anti-inflammatory, or gluten-free diet has improved their condition. The reasons for this are unclear. On the one hand, certain types of foods may add to the inflammatory burden that characterizes psoriatic arthritis. On the other, taking charge of one's health invariably promotes a better sense of well-being, reduce the stress that can trigger disease symptoms. Regardless, it is beneficial to maintain a healthy diet if living with psoriasis or psoriatic arthritis. By eating right, exercising regularly, and maintaining an ideal weight, you can't help but manage your disease better, too. Here's more on the three dietary approaches supported by some, including why they might be helpful in preventing or managing psoriatic arthritis. How Psoriasis and Psoriatic Arthritis Are Linked vanillaechoes / Moments / Getty Images Low-Calorie Diet Obesity is a risk factor for not only developing psoriatic arthritis but also experiencing worse or more frequent flares. People with obesity have larger amounts of adipose (fat-storing) tissues which release inflammatory substances, known as cytokines, into the bloodstream. As such, the greater the adiposity, the greater the inflammation. Psoriasis and psoriatic arthritis are both inflammatory autoimmune diseases. It stands to reason that being overweight simply adds to the inflammatory burden. This photo contains content that some people may find graphic or disturbing. See Photo Psoriasis. DermNet / CC BY-NC-ND psoriatic arthritis. DermNet / CC BY-NC-ND A 2017 study in the Journal of Investigative Dermatology reported that obesity, defined as a body mass index (BMI) of 30 or more, increases your risk of psoriatic disease by 87% irrespective of all causes. In contrast, a 2015 study in the British Journal of Dermatology concluded that eating three low-calorie meals per day and exercising three times weekly reduced the severity of psoriatic symptoms in 48% of study participants. There are some dietary tips that may help if you have psoriatic arthritis: Count calories: One pound of fat equals 3,500 calories. By reducing your daily intake by 500 calories, you can lose a pound per week. Trim visible fat from meat: This includes removing the skin from poultry. Broil, bake, or steam foods: Do not deep fry. Cut back on refined sugar: This includes sweetened drinks. Eat fewer refined carbs: Instead of white bread, white flour, or white rice, opt for complex carbs like whole grains. Avoid saturated fats: Instead, choose monounsaturated or polyunsaturated fats, which can increase your "good" high-density lipoprotein (HDL) cholesterol. Fill at least half your plate with vegetables and fruit: Reserve a quarter of your plate for grains and leave less than a quarter for protein. How Obesity and Inverse Psoriasis Are Linked Anti-Inflammatory Diet Certain foods are known to trigger inflammation. The rationale behind an anti-inflammatory diet is that, by avoiding foods known to cause inflammation, your body will be better able to manage diseases like psoriasis and psoriatic arthritis, as well as diabetes, gout, heart disease, ulcerative colitis, Crohn's disease, and irritable bowel syndrome. To date, there is little evidence to support such far-reaching claims. But, at the same time, many of the foods that are inflammatory are the types you would want to avoid anyway for general health reasons. If you decide to embark on an anti-inflammatory diet, choose foods rich in antioxidants and omega-3 fatty acids, and avoid foods inordinately high in omega-6 fatty acids. Foods to Eat on an Anti-Inflammatory Diet Apples Avocados Beans Berries Cherries Dark green leafy vegetables Nuts Oily fish Sweet potato Whole grains 70% dark chocolate Food to Avoid on an Anti-Inflammatory Diet Dairy High-fructose corn syrup Margarine Red meat Refined Carbohydrates Sugar Trans fat Vegetable oil Among the dietary approaches believed to be beneficial to people with psoriatic arthritis is the Mediterranean diet. This is a well-balanced, anti-inflammatory diet rich in fruits, vegetables, legumes, grains, fish, and olive oil, but low in dairy and red meat. The evidence supporting its use in psoriatic arthritis is lacking. However, a 2018 study in JAMA Dermatology suggested that consuming a Mediterranean diet for two years may reduce the severity of psoriasis by as much as 29%. Despite the positive findings, the study was criticized for the subjective measurements used by the researchers, which relied on a patient self-assessment questionnaire rather than the Psoriasis Area and Severity Index (PASI) standardly used in psoriasis research. Gluten-Free Diet People with psoriatic arthritis are more likely to have two or more autoimmune diseases (referred to as polyautoimmunity) compared to people in the general population. One of the more common comorbid conditions is celiac disease, an autoimmune disorder characterized by an abnormal immune response to gluten. In fact, a 2015 review of studies in the Journal of the American Academy of Dermatology reported that people with psoriatic disease are 2.2 times more likely to have celiac disease than those without. Psoriasis and celiac disease share many of the same genetic mutations believed to predispose a person to the diseases. However, it is unclear whether gluten actually triggers psoriasis as some have suggested. Others believe that gluten has more of a knock-on effect. That is, it is possible that gluten triggers the initial celiac disease symptoms, but the resulting inflammation is what incites a psoriatic flare. No one really knows for sure. Given these possibilities, a gluten-free diet may be well worth exploring, especially if you have symptoms of gluten intolerance. With that said, there are pros and cons to any restricted diet, particularly one like a gluten-free diet in people with no clinical evidence of gluten intolerance. Benefits of Going Gluten-Free Encourages the reading of food labels Greater awareness of food ingredients Introduction of higher quality carbs into your diet Risks of Going Gluten-Free Reduction in essential nutrients due to food restrictions Digestion problems due to reduced fiber Weight gain as your body adjusts to the diet If you believe that you have celiac disease, speak to your rheumatologist. Tests are available to confirm your suspicion. If you proceed with going gluten-free, you should also seek guidance from a dietitian or nutritionist experienced in gluten intolerance to ensure you meet your daily recommended intake of key nutrients. How Psoriasis and Celiac Disease Are Linked 5 Sources Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. National Psoriasis Foundation. Psoriasis and diet: researchers examine the relationship between food and disease. Snekvik I, Smith CH, Nilsen TIL, et al. Obesity, Waist Circumference, Weight Change, and Risk of Incident Psoriasis: Prospective Data from the HUNT Study. J Invest Dermatol. 2017;137(12):2484-2490. doi:10.1016/j.jid.2017.07.822 National Psoriasis Foundation. Anti-Inflammatory Diet. Phan C, Touvier M, Kesse-guyot E, et al. Association Between Mediterranean Anti-inflammatory Dietary Profile and Severity of Psoriasis: Results From the NutriNet-Santé Cohort. JAMA Dermatol. 2018;154(9):1017-1024. doi:10.1001/jamadermatol.2018.2127 Bhatia BK, Millsop JW, Debbaneh M, Koo J, Linos E, Liao W. Diet and psoriasis, part II: celiac disease and role of a gluten-free diet. J Am Acad Dermatol. 2014;71(2):350-8. doi:10.1016/j.jaad.2014.03.017 Additional Reading Bhatia, B.; Millsop, J.; Debbaneh, M. et al. Diet and Psoriasis: Part 2. Celiac Disease and Role of a Gluten-Free Diet. J Am Acad Dermatol. 2014 Aug;71(2): 350-58. doi:10.1016/j.jaad.2014.03.017 Naldi, L.; Conti, A.; Cazzaniga, S. et al. Diet and physical exercise in psoriasis: a randomized controlled trial. Br J Dermatol. 2014 Mar;170(3):634-42. doi:10.1111/bjd.12735 National Psoriasis Foundation. Anti-Inflammatory Diet. Portland, Oregon. Phan, C.; Touvier, M.; Kesse-Guyot, E. et al. Association Between Mediterranean Anti-inflammatory Dietary Profile and Severity of Psoriasis: Results From the NutriNet-Santé Cohort. JAMA Dermatol. 2018;154(9):1017-24. doi:10.1001/jamadermatol.2018.2127 Snekvik, I.; Smith, C.; Nilsen, T. et al. Obesity, Waist Circumference, Weight Change, and Risk of Incident Psoriasis: Prospective Data from the HUNT Study. J Invest Dermatol. 2017 Dec;137(12):2484-90. doi:10.1016/j.jid.2017.07.822 By Carol Eustice Carol Eustice is a writer covering arthritis and chronic illness, who herself has been diagnosed with both rheumatoid arthritis and osteoarthritis. 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