I have been reading that virtually all yellow corn is genetically modified (roundup ready). I minimize the amount of corn I eat because they say the pesticide gene stays in your gut. They do not know what GMO corn can do to the human body because they did few, if any studies on this subject.
Here is a good list of which foods are alkalizing and which are acid producing when eaten.
Incidentally, corn is acid producing.
http://www.rense.com/1.mpicons/acidalka.htm