Psoriasis (Ps) and psoriatic arthritis (PsA) are associated with increased risk of metabolic syndrome (MetS), body fatness and cardiovascular risk. Additionally, oxidative stress and inflammation are also contributing mechanisms on Ps and PsA. However, little is known about the influence of diet and micronutrients on the main outcomes of these diseases. The aim of the investigators is to evaluate the effectiveness of an intervention diet program on disease activity, metabolic profile and oxidative stress inpatients with Psoriasis and Psoriatic Arthritis.

Inclusion Criteria:

• patients with psoriatic arthritis, according to the Classification Criteria of Psoriatic Arthritis (CASPAR)

Exclusion Criteria:

• lack of written informed consent;
• age < 18 years old;
• history of gastrointestinal, endocrine, pulmonary, kidney, hepatic, and neuromuscular diseases, as well as HIV-positive;
• pregnant or breast-feeding women;
• previous history of cancer;
• use of steroids, protein supplements, vitamins, multivitamins, or antioxidants.
• Specific medications to PsA and physical activity were required to be stable for the last 3 months to be included in the study