Through which organ is food ingested into the body?

Food is ingested into the body through the mouth. 

The mouth is the primary organ for the intake of food, where it is initially broken down by chewing and mixed with saliva. Saliva contains enzymes that help break down carbohydrates. 

Once the food is chewed and mixed with saliva, it is swallowed and travels down the oesophagus to the stomach, where further digestion takes place. 

In the stomach, digestive enzymes and stomach acid break down the food into smaller components. 

The nutrients are then absorbed into the bloodstream and transported throughout the body to provide energy and support normal bodily functions. Therefore, the correct answer is "Mouth."