What are the main steps of nutrition in humans?

The main steps of nutrition in humans can be summarized as follows:

Ingestion: This is the process of taking in food through the mouth.
Digestion: This is the process by which food is broken down into smaller molecules that can be absorbed and used by the body. Digestion occurs in several stages:

Mechanical digestion: This involves the physical breakdown of food through chewing, grinding, and churning.
Chemical digestion: This involves the breakdown of food molecules into simpler substances by enzymes produced in the mouth, stomach, pancreas, and small intestine.

Absorption: This is the process by which nutrients are taken up from the digestive tract into the bloodstream and transported to the cells of the body where they are needed.
Transport: Once absorbed, nutrients are transported via the bloodstream to various tissues and organs in the body.
Metabolism: This is the process by which nutrients are used by the body to produce energy, build and repair tissues, and carry out other functions.
Elimination: This is the process of removing waste products from the body through the digestive tract as feces.

Overall, these steps are critical to ensure that the body has the necessary nutrients to maintain its functions, growth, and repair.

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