If you suffer from nasal polyps then you should certainly avoid certain foods that can trigger the problem.
It is generally good to avoid foods that can cause allergic reaction or foods that contain allergens.
Foods with preservatives should be certainly on the list of foods that you need to avoid.
Then there are certain foods that may increase the production of mucus in the nasal lining, therefore you should definitely avoid those foods.
There are certain foods that may cause inflammation in the body and this includes the nasal passage. These foods also need to be avoided.
Alcohol should not be taken as this is one of the items that causes swelling and may worsen your condition.
Milk and diary products like butter, ghee, cheese, soy etc should be avoided or taken in limited quantity only. These items cause swelling in the nasal lining and may worsen your condition.
Canned vegetables, instant foods, soft drinks, chips, items with preservatives, pickles etc should be avoided.
Eat a well balanced food that has vitamin C, E and A. These vitamins are known to prevent nasal polyps.