NUTRITION

Protein: Why do we need it? Audio Podcast Protein: Why do we need it?

Todays Lesson To develop an awareness of the importance of the macronutrients namely protein the diet. Recall previous knowledge of last class on healthy eating Describe composition of protein Understand composition of protein List sources of protein Relate to functions of protein Calculate individual RDA of protein  

QUESTION TIME Name the six nutrients List the healthy eating guidelines? What do you do to keep healthy? How do some people lead unhealthy lives?

Why do you eat food? To give a feeling of fullness The social aspect To get goodness out of it To prevent illnesses

What goodness do we get from food? Strong bones and teeth Energy Growth Prevents constipation General good health Nutrients in foods do these and more jobs in the body

PROTEIN FAT WATER NUTRIENTS MINERALS CARBOHYDRATE VITAMINS

Nutrients Macro Nutrients Micro Nutrients Our bodies need these in large amounts They are too big to be absorbed by the body so they must be broken down Protein, fats and carbohydrates Our bodies need these in small amounts They are small enough to be absorbed by the body once eaten Minerals and vitamins

PROTEIN

CLASSIFY FUNCTIONS SOURCES PROTEIN STRUCTURE

PROTEIN STRUCTURE Proteins are made up of amino acids Amino acids are joined together with peptide links

CLASSIFICATION OF PROTEIN HIGH BIOLOGICAL VALUE PROTEIN LOW BIOLOGICAL VALUE PROTEIN Contains all essential amino acids Essential amino acids are the amino acids the body needs but cannot make so must get them from food Normally come from animal foods Do not contain all essential amino acids Normally come from vegetable foods

SOURCES OF PROTEIN High biological value Low biological value Meat, Fish, Eggs Cheese Peas, Beans, Nuts, Pasta

BIOLOGICAL FUNCTIONS OF PROTEIN Growth Repair of worn out or damaged cells Production of hormones, enzymes and antibodies. Gives us energy and heats our body

RDA Adults require 1g of protein for each kg of body weight. Eg: If I way 70kg I will need 70g of protein daily. Using your tablets, draw up a list of food items that will equal 70g of protein in your daily diet.

QUESTION TIME What are protein chains made up from? Classify protein into its two groups Name three animal protein foods Name three vegetable protein foods Name three biological functions of protein What link joins the amino acids together along the protein chain What are essential amino acids