Hyperthyroid patients, patients taking tetracycline and erythromycin, patients taking potassium and spironolactone drugs, gout patients should not eat nori. Hyperthyroidism patients themselves produce too much thyroid hormone, and seaweed is rich in iodine, iodine as the synthesis of thyroid hormone raw materials, will make the patient’s body thyroid hormone, aggravate the condition, so should not eat seaweed. Tetracyclines as well as erythromycin react with calcium in purslane to produce insoluble chelates, so that the drugs are unable to play a role, should not eat purslane. Potassium supplements and spironolactone tablets can elevate blood potassium levels, and nori is rich in potassium, consumption of nori is likely to lead to elevated blood potassium, or even higher than normal, hyperkalemia, life-threatening. Gout patients have high uric acid value. Purple cabbage belongs to high purine food, and purine as the synthesis of uric acid raw materials, too much eating purple cabbage can lead to aggravation of gout attack. If you have any problems, you should seek medical advice and treatment under the guidance of your doctor.