Diet Interventions in Psoriatic Arthritis

Prior treatment

• Use of systemic corticosteroids

Other illness

• All persons who would be placed at an increased risk including any medical condition that will impair the ability of the person to participate in a nutritional intervention study (e.g. insulin dependent diabetes, use of coumadin, advanced malignancy, inflammatory bowel disease, dementia)
• History of food allergy to any of the components of olive oil or nuts

Age

• Known pregnancy (pregnancy testing will be performed for women of childbearing age; weight changes will not accurately reflect the changes we would anticipate in pregnant patients and weight loss may be detrimental to maternal and/or fetal outcomes).

Other

• Inability to provide informed consent
• Plan to change systemic treatment for psoriasis or PsA in the next 4-8 weeks
• Inability to read and write in English
• Unwillingness to change dietary habits
• Participation in another physical activity study and/or diet trial

• Age 18-80
• Required Rheumatologist-confirmed diagnosis of PsA fulfilling Classification of Psoriatic Arthritis Criteria (CASPAR)
• Willing to alter diet and participate for 24 weeks
• Able to attend follow-up visits
• Body mass index (BMI) \> 25 and \<40
• No history of eating disorders such as anorexia or bulimia
• Disease Activity in Psoriatic Arthritis Assessment (DAPSA) \> 10
• Stable treatment for PsA for ≥3 months prior to enrollment (patients may be on any disease modifying anti-rheumatic drugs (DMARDs) or they can be free of systemic medications
• Owns and uses an iPhone or Android smart phone, or is willing to use a device provided by the study team