Of course it's recognized as food - both by your brain and your body. That's why it makes you fat. If your body didn't recognize it as food it would just exit without contributing any food value. That's because many people heed the desires of their bodies rather than the dictates of their higher thought processes. We have an evolutionary drive to eat high calorie foods, and often that wins out even in environments where that is not beneficial overall. Well, if you truly have ill effects (i.e. vomiting and diarrhea for two days) then your mind and body will indeed reject it for quite some time. But from an evolutionary standpoint, "feeling sluggish" is not negative. It's actually a positive; you take a nap and convert all that sugar and starch into lifesaving fat (which was once important.) It's pretty logical when you see where the original drives come from.