Absorption, and the liver Digestion breaks down food so it can be absorbed into your blood and carried to all parts of your body. Carbohydrates are digested into glucose, proteins into amino acids, and fats and oils into fatty acids and glycerol. But Vitamins, minerals, and water in food don’t have to be digested since they are already easily absorbed. Digested foods are absorbed through your gut wall into the blood and carried away. Most absorption goes on in your small intestine. Your small intestine is over six metres long. Inside, millions of tiny fingers called villi stick out of its walls. One villus is about a millimeter long. Absorption takes place through the villi. They provide a large surface for absorbing digested food.