Why do i get bloated when i eat cornflakes?

Well, this could be caused by different things. Did you check the sodium content on the package? If the particular brand of corn flakes is high in sodium that can cause bloating from water retention. Secondly, to your knowledge are you allergic to corn? Another thing is if the corn flakes are made with artificial sweeteners this can happen because artificial sweetners are made with chemicals which are toxic to some people and can cause bloating. You may be allergic to artificial, colors, flavorings, or preservatives as well. Food allergies can cause bloating as well as other digestive disturbances. I would try switching to all natural corn flakes and see if this helps if not you may want to seek medical advice from your personal physician and perhaps get tested for food allergies.