The answer is; Cells won't get the nutrients they need for survival.
The digestive system is significant in the digestion and absorption of food in the body. After different stages of digestion along the alimentary canal, nutrients are absorbed in the ileum (that has microvilli to increases the surface area for food absorption). After the nutrients are absorbed they are taken to the liver and cells for metabolism through the bloodstream. The nutrients are used to produce ATP and to build the cell.