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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