Have not experienced (not that I really remember anyway) what you are describing Gardentime, but I think I know what the answer is.It is that corn, peas and blueberries have very tough 'outer' skins. It is not uncommon for most people to pass undigested corn kernels, due to the fact that the gut cannot break down the 'skin' or 'husk' of the corn kernel.It comes down to soluble and insoluble fibre I think. The skin on the corn kernel is insoluble and the inner is soluble, same with peas and blueberries.I would not be concerned, unless you see a lot of undigested matierial (of all kinds not just corn, peas, blueberries)cause that could be an indication of Celiac disease.Hope that helps.Take care.