How should you eat when you have allergic purpura nephritis, what should you eat and what should you not eat. To find the allergen, if you can find the allergy that causes allergic purpura nephritis food, avoid eating these foods again. You should eat things that are rich in nutrients and easy to digest, such as fresh vegetables and fruits. For patients who develop blood in urine, this is definitely the time to avoid spicy, irritating and seafood, such as common ones like mutton and goose, which lead to aggravation of the condition. Also be sure to pay attention to the cold and keep warm, pay attention to the cold, strengthen exercise and enhance physical fitness.