There are various definitions of "processed". Technically it means anything that was manipulated from it's pure form, however most likely when you see it, we are referring to the carbs that are refined to a point where the beneficial nutrients are removed and it has been processed to a point where your body will handle it differently than it would in whole form. Example...an apple, vs. apple sauce vs. apple juice. The juice is the most processed and will spike your blood sugar more so than a whole apple. Another example would be oats - oat groats, steel cut oats, rolled oats, instant oats. The latter is the most processed. However, processed carbs that we are referring to are things like high sugar sweets, cookies, cakes, white breads, etc.