Psoriasis foods. There are certain foods that can aggravate psoriasis, nut cause them. Alcoholic beverages can often make psoriasis worse. If you think you may know of a relationship between a food and the increase of your psoriasis, stop the food and see what happens.To test your theory out, after you have no more lesions, and then try that food again. If you break out, you will know that is the culprit.