AIM:

1

• AIM
• INTRO TO NUTRITION
• Do Now
• Copy HW
• Why do we need to digest our food?
• How do we digest our food?

2
What is NUTRITION?

• process by which an organism obtains materials
  and energy from its environment processes them
  for its own use.
• TWO TYPES
• AUTOTROPHIC NUTRITION
• 2. HETEROTROPHIC NUTRITION

3
What is HETEROTROPHIC NUTRITION?

• nutrition where an organism must consume or take
  in preformed organic compounds (food).
• Involves 3 processes
• INGESTION taking in food
• DIGESTION breaking down food
• To make nutrients small enough to get
  into cells.
• By HYDROLYSIS !

WHY?
HOW?
4

• EGESTION elimination of undigested food.
• - solid wastes (feces).
• What is a NUTRIENT?
• substances that organisms need to ingest in order
  to live.
• They are

1. WATER
3. FATS
5. VITAMINS
2. CARBOHYDRATES
4. PROTEINS

• MINERALS

5
Why needed?

• nutrients provide materials energy needed to
  carry out metabolic activities (life processes).
• There are 2 types of metabolism
• ANABOLISM building cells tissues.
• You are what you eat!
• The matter in foods ingested becomes the matter
  that makes you up!

6

• 2. CATABOLISM breaking down processes.
• What is ENERGY??
• the ability to do WORK!!
• - unit used to represent amount of energy in food
  is called the CALORIE.

7
Which nutrients provide energy?

• 1. Carbs 4 cal/g
• 2. Fats 9 cal/g
• Proteins 4 cal/g
• to figure out the amount of calories in food they
  burn it.
• Amount of calories in food depends on amount of
  nutrients in them (the more fat, the more
  calories)

8

• What affects the amount of calories a person
  needs to consume in a day to maintain their body
  weight?
• activity level -Size
• age - sex