2.1.1 Biochemistry and Metabolism

You are what you eat:

The nutrients any organism takes in build and maintain a healthy body because:

·         They become part of your body – often after being broken down into smaller pieces (digested), and then rebuilt to form different parts of the organism.

·         They are used to provide energy needed to drive metabolism (living processes).

If substances taken into the body cannot be digested or take part in metabolic processes, they are removed from the body.

Organisms are adapted to remove these substances in a variety of ways. For example the human intestine is adapted to work best when indigestible fibre is present in food. The fibre does not provide nutrients for building the body. It does not provide energy, but it is an essential component of the diet à eases flow of materials through the gut by giving the gut muscles a bulk to push against.

Fibre also helps to remove some waste products such as excess bile salts = toxic. A diet in low fibre is a risk factor for a no. of diseases including intestinal cancer + other cancers.



Hannah Staples


I found this very useful... thankyou! :)