4 stages of food processing
1ststage: Ingestion is the act of eating. (4 ways to do this)
2ndstage: Digestion breaks down food into molecules small enough for the body to absorb.
3rdstage: Absorption is the uptake of small nutrient molecules, such as amino acids and simple sugars. The cells lining the digestive tract absorb the products of digestion; the nutrients,which travel in the blood to body cells to provide energy. Foodnot needed immediately are converted to fat for storage.
4thstage: Elimination is the passing of undigested material out of the digestive compartment.