Low-grade systemic inflammation associated with obesity may worsen the clinical course of psoriasis. Both a low-calorie diet and nutritional supplementation have been shown to have an impact on the clinical course of psoriasis, including an anti-inflammatory effect of n-3 polyunsaturated fatty acids (PUFAs). This study aimed to assess the effectiveness of an energy-restricted diet, enriched in n-3 PUFAs and poor in n-6 PUFAs, on metabolic markers and clinical outcome of obese patients with psoriasis.