For those with chronic idiopathic urticaria (chronic hives), an elimination diet for 3 weeks may help. Certain foods act as triggers for hives. Although these are not food allergies, avoiding tomatoes, alcohol, seafood, food additives, herbs, candy, and chewing gum may be helpful, as demonstrated in research studies. Avoiding hive triggers is important, and has been researched far more than recommendations on foods to eat to heal chronic hives.