Diet Interventions in Psoriatic Arthritis

Inclusion Criteria:

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

Exclusion Criteria:

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