Having eaten KFC the day before Thanksgiving, and then spending several hours in a highway rest stop the next day while trying to get home, while a large Green-Mile-type-black-man stood outside with a mop, and then having the same feeling for the last month for unexplained reasons, I must say that stool samples, while somewhat unrelated to this thread, are very interesting.
Having had to sample my shit at my Doctor's orders quite frequently recently, as the feeling of urgent poo mixed with bloating and constipation has not subsided since my ill-fated KFC meal, I will tell you that it is very true that garbage in equals garbage out.
Try it at home folks. Sample your poo after a quality home cooked meal. Then sample it after a three course Viet Thai dinner at your local THAI PALACE or THAI PALACE GOLDEN WALL or whatever it is called.
See for yourselves. Just don't keep it in the fridge.