Film, Media & TV3 mins ago
No best answer has yet been selected by sandbach99. Once a best answer has been selected, it will be shown here.For more on marking an answer as the "Best Answer", please visit our FAQ.
Oh yes indeed, that's the definition of digestion. There are some chemicals called binary poisons, that are benign alone but toxic when in the body together.
The stuff you excrete, apart from the fibre, is chemically very different from your food as nutrients are removed. Your gut is a massive colony of bacteria that does most of your dirty work for you.
The skin is a water-proof barrier, but some chemicals may get through to cause alergic or lethal reaction