Why does food have to go to the liver before the rest of the body?

The liver plays an important role in the digestion. The reason for this is that when digested nutrients from the small intestine drain directly into veins which connect into the portal vein. Therefore these nutrients need to be filtered as a first stop before going to the rest of the organs. Blood from the digestive system is full of nutrients impaired from intestinal digestion. Sugars, fatty acids and amino acids are produced in the digestion of carbohydrates, fats and protein respectively. Along with them many bacteria, toxins also get absorbed. So they are taken to the liver where fatty acids are transported for utilisation, amino acids are converted into various critical proteins like albumin. The liver also detoxifies harmful substance from the blood. The liver is the filter and hence is the first portal for blood from the digestive tract.