food contains nutrients & a protein is a kind of nutrient ->  food contains proteins  food contains proteins & the digestive system digests food for the body ->  the digestive system digests proteins for the body  the digestive system digests proteins for the body & the small intestine is a part of the digestive system ->  a small intestine is a part of a human 's digestive system for the digestion of proteins  food contains nutrients & a protein is a kind of nutrient ->  food contains proteins  food contains proteins & the digestive system digests food for the body ->  the digestive system digests proteins for the body  the digestive system digests proteins for the body & the stomach is a part of the digestive system ->  a stomach is a part of a human 's digestive system for the digestion of proteins  a small intestine is a part of a human 's digestive system for the digestion of proteins & a stomach is a part of a human 's digestive system for the digestion of proteins -> digestion of proteins occurs in the stomach / small intestine