Dear Doctor: I’m 27 years old and have itchy skin that my doctor says is psoriasis. Can my diet help prevent or control the condition? Dear Reader: Psoriasis is a chronic skin condition associated with a malfunction of the immune system. Research suggests that avoiding inflammatory foods may help ease some psoriasis symptoms and lessen the frequency of flares. And when it comes to food, the responses to dietary changes in people living with psoriasis are highly individual.