Pure sugar (sucrose i.e white or brown sugar) is okay in moderation.
I eat oatmeal for breakfast everyday so I don't worry or know much about other cereals. However, rice and corn cereals without HFCS or fruit, especially dried fruits and fruit juice concentrates, are safe. With all cereals you have to be careful of how much IF is in them.
Is this diet making a difference to your gas and bloating yet?
-------------------- STABLE: ♂, IBS-D 50+ years - Science of IBS