Question

the digestive system process food into usable and unusable materials what happens to the unusable food

Answer 1

the unusable food inside our body, comes out in the form of sweat or from the excretory system- [ when we go to washroom ]

Answer 2

Only the nutrients in the food get digested. Not the whole food. This whole food is seen as unusable material. This material is egested or excreted out of anus.