Study Notes
The 5 steps of nutrition involve processes that help the body obtain and use nutrients from food.
- Ingestion — the process of taking food into the body through the mouth. Example: Eating an apple.
- Digestion — the breakdown of food into smaller, absorbable components. Example: Stomach acids breaking down proteins.
- Absorption — the process by which nutrients from digested food are taken into the bloodstream. Example: Nutrients passing through the walls of the small intestine.
- Assimilation — the use of absorbed nutrients by the body to build and repair tissues. Example: Using amino acids to build muscle tissue.
- Egestion — the removal of undigested food and waste from the body. Example: Expelling waste through the rectum.
Exam Tips
Key Definitions to Remember
- Ingestion: Taking food into the body through the mouth.
- Digestion: Breaking down food into smaller components.
- Absorption: Nutrients entering the bloodstream from the digestive tract.
- Assimilation: Using absorbed nutrients for body functions.
- Egestion: Removal of undigested waste from the body.
Common Confusions
- Confusing absorption with assimilation.
- Thinking digestion only occurs in the stomach.
Typical Exam Questions
- What is the role of digestion in nutrition? Digestion breaks down food into smaller components for absorption.
- How does absorption differ from assimilation? Absorption is the uptake of nutrients into the bloodstream, while assimilation is the use of these nutrients by the body.
- What happens during egestion? Egestion is the removal of undigested waste from the body.
What Examiners Usually Test
- Understanding of each step in the nutrition process.
- Differences between digestion, absorption, and assimilation.