- Food contains nutrients
- A protein is a kind of nutrient
- Hence, food contains proteins

- Food contains proteins
- The digestive system digests food for the body
- Hence, 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
- So, 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
- So, food contains proteins

- Food contains proteins
- The digestive system digests food for the body
- Therefore, 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
- Hence, 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
- Hence, digestion of proteins occurs in the stomach / small intestine

So, digestion of proteins occurs in the stomach / small intestine
In the human body the digestion of proteins takes place primarily in which two organs?
- Food contains nutrients 
- The small intestine is a part of the digestive system 
- The stomach is a part of the digestive system 
- The digestive system digests food for the body 
- A protein is a kind of nutrient