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Diet and exercise
What does a healthy diet contain?Why can some people eat a lot of food without
getting fat?How do we calculate BMI?
Starter: Using the food pyramid list your meal last night and put it into food groups. Was it a healthy meal? Why
or why not?
Food groups
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Match the food to the food group (some may have more than one group)
• Cheese Vitamins
• Eggs Water
• Steak Fibre
• Wholemeal bread Carbohydrates
• Iron Protein
• Niacin (vit B12) Fat
• Fruit Juice Minerals
Peter’s fat - how did it happen?
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Muscles and fat
• Muscles require energy, and so does fat. • However muscles use more energy
when they are used more often in exercise.
• Fat cannot be made to use more energy.
• So people who exercise more, and have more muscle, will use more energy.
• This means they need more food.
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Other factors
• Living in a very hot place means you don’t need to expend energy staying warm so you need less food.
• Living in a very cold place means you need to use a lot of energy to keep warm, so you need more food.
Metabolic rate
• This is a measure of how quickly your body uses up energy when you are not doing anything
• Muscles use more energy than fat in their basic reactions, so men tend to have a higher Basic Metabolic Rate (BMR) than women.
• Exercise also increases BMR.
Athletes and you
• Write a few sentences to explain why an athlete needs more food in a day than you do.
• Do you think you need more or less energy than a 70 year old? Why?
Work to do
BMI is a measure of health in relation to height and weight.
We work it out by measuring our height, squaring it then diving our mass by the number we get.
BMI =
Using the rulers and scales at the front work out your BMI.
Height2 (height x height)
Mass
BMI problems
• You have an 18 stone athlete. 5’10”, does training 5 times a week.
• You also have an 18 stone unemployed woman. Also 5’10”, doesn’t do any exercise.
• Their BMI is the same. What’s the problem?
Work to do
• Answer questions 7 & 9.
Diet and exercise
What does a healthy diet contain?Why can some people eat a lot of food without
getting fat?How to work out BMI?
Plenary: Watch the Butterfield Diet Plan. What’s wrong with the diet?
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