How the digestive system works
The digestive system refers to a collection of organs that work together to break down food and drink. They digest what is consumed, turning nutrients into energy that the body can use for functioning or store for later use.
The digestion process begins in the mouth, where food is broken down so that it can be swallowed. Food then travels down the food pipe (esophagus) towards the stomach and intestines.
The digestive juices in the stomach and intestines break down the food for the final time and extract the nutrients. The waste passes into the large intestine for excretion through the anus.
Any problems during this digestive process can cause nausea after eating.
Symptoms will often develop in the stomach or upper abdominal area, where the large-scale breakdown of food begins.
Sometimes the body reacts to these problems by forcibly emptying the stomach, usually through vomiting. The problem can sometimes be identified by the color of the vomit. For example, a bright yellow or dark green color may indicate a problem in the small intestine.