The time it takes for food to be digested is directly related to the type. Usually vitamins, trace elements, minerals, and water do not need to be digested and are absorbed directly in the intestine, starch and sucrose need to be broken down directly into glucose before they can be absorbed by the body as simple sugars, which can take 2-4 hours in this case, and proteins take 4-6 hours when they are broken down into amino acids. In the case of fat, it takes 6-10 hours to be broken down and absorbed, and 6 hours for both protein and nucleic acids, and usually 4 hours after eating to be digested. If you have eaten hard or greasy food before, the digestion time may reach 5-6 hours. If you have previously eaten only semi-liquid food, the digestion time is only about 2-3 hours, so the digestion time is not fixed.