It also goes to show that food can still look good despite being old and how photographs can be decieving! Food ads have photographs of fruit etc that has been sprayed with gloss to make them look shiny. Colours are enhanced and all sorts of tricks are played to make the photograph of the food inviting. Even worse, you would never know if today's takeaway was really 2 days old and simply warmed up.
God only knows what this junk does to the natural flora in your gut!
Actually, the answer is nothing really. The gut flora of the caucasian population isn't generally affected by what we eat or drink. Of course, it can be, but it usually isn't. Thats why you can eat food and not be ill every time...
Oh, this video on fStoppers is interesting in terms of food photography and how the styling works (mashed potato for ice cream, glycerin etc).