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DOES DOES SIZE SIZE

MATTERMATTER??

GCSE BiologyGCSE Biology

By Dr H E BloomfieldBy Dr H E Bloomfield

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People come in a range of People come in a range of shapes and sizesshapes and sizes

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Are these Are these Welsh Welsh

athletes OK?athletes OK?

Tanni Tanni Grey-Grey-ThompsonThompson

Gavin Gavin HensonHenson

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Are these Are these people OK?people OK?

Dawn FrenchDawn French

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Are these children OK?Are these children OK?

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Is Is this this OK?OK?

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Health Problems Health Problems Linked to Linked to ObesityObesity

Greater risk of developingGreater risk of developing

high blood pressurehigh blood pressure

heart diseaseheart disease

diabetes (high blood sugar)diabetes (high blood sugar)

arthritis (worn joints due to the extra arthritis (worn joints due to the extra pressure put on them)pressure put on them)

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Note the folds of Note the folds of skin and fat and the skin and fat and the damage to the knee damage to the knee joint.joint.

The space between The space between the thigh and shin the thigh and shin bones should be bones should be even on both sides. even on both sides. The top of the shin The top of the shin bone is also rough. bone is also rough.

Leg X-ray leg from a Leg X-ray leg from a 23 year old person 23 year old person who weighs 175 kg who weighs 175 kg (about 28 stones).(about 28 stones).

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Are Are these these

athleteathletes OK?s OK?

Paula Paula RadcliffRadcliff

ee

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Are these Are these supermodelsupermodel

s OK?s OK?

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Are these children OK?Are these children OK?

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Is this Is this OK?OK?

These people These people have have

AnorexiaAnorexia

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Any comments?Any comments?

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Health Problems Linked to Health Problems Linked to LackLack of Food of Food

Reduced resistance to infectionReduced resistance to infection

Irregular periods and lower fertility in Irregular periods and lower fertility in womenwomen

People can also develop health People can also develop health problems (problems (deficiency diseasesdeficiency diseases) if ) if their diet is missing a particular their diet is missing a particular food groupfood group

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Is Is this this OK?OK?

The The effects of effects of

iodine iodine deficiencydeficiency The effects The effects

of protein of protein deficiencydeficiency

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Is Is this this OK?OK?

These These children children

have have ricketsrickets caused caused

by a lack by a lack of of

Vitamin DVitamin D

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Are these OK?Are these OK?

Ant and Ant and DecDec

ChantelChantellele

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END OF END OF PART 1PART 1

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BODY MASS BODY MASS INDEX (BMI)INDEX (BMI)

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Body Mass Index (BMI)Body Mass Index (BMI) is a number is a number calculated from a person’s height calculated from a person’s height and weight.and weight.

It is a measure of body fatness and It is a measure of body fatness and applies to adults over 20, applies to adults over 20, not to not to growing childrengrowing children..

A person can use their BMI to find A person can use their BMI to find out if they’re a healthy weight for out if they’re a healthy weight for their height.their height.

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Calculating Body Mass Index Calculating Body Mass Index (BMI)(BMI)

BMI = BMI = Weight in kg Weight in kg (Height in m)(Height in m)22

ExampleExample If a person is 1.60 m tall If a person is 1.60 m tall and weighs 65 kg,and weighs 65 kg,

BMI = BMI = 65 65 = = 65 65 = 25.39 = 25.39 1.601.6022 2.56 2.56

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What BMI figures What BMI figures meanmean

BMIBMI What it meansWhat it meansLess than Less than

18.418.4You are You are underweightunderweight for your for your heightheight

18.5 to 24.918.5 to 24.9 You are an You are an ideal weightideal weight for your for your heightheight

25 to 29.925 to 29.9 You are You are overweightoverweight

30 to 39.930 to 39.9 You are You are obeseobese

Over 40Over 40 You are You are very (or morbidly) obesevery (or morbidly) obese

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Fred FlintstoneFred FlintstoneHeight = 180 cm = 1.80 mHeight = 180 cm = 1.80 m

Weight = 105 kgWeight = 105 kg

BMI = BMI = 105 105 = =

1.801.8022

What it means - What it means - OBESEOBESE

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Fred FlintstoneFred FlintstoneHeight = 180 cm = 1.80 mHeight = 180 cm = 1.80 m

Weight = 105 kgWeight = 105 kg

BMI = BMI = 105 105 = = 105 105 = = 32.432.4

1.801.802 2 3.243.24

What it means - What it means - OBESEOBESE

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Marge SimpsonMarge SimpsonHeight = 1.50 mHeight = 1.50 m

Weight = 55 kgWeight = 55 kg

BMI = BMI = 55 55 = =

1.501.502 2

What it means - What it means -

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Marge SimpsonMarge SimpsonHeight = 1.50 mHeight = 1.50 m

Weight = 55 kgWeight = 55 kg

BMI = BMI = 55 55 = = 55 55 = 24.4 = 24.4

1.501.502 2 2.252.25

What it means - What it means - IDEAL IDEAL WEIGHTWEIGHT

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Olive OyleOlive OyleHeight = 1.84 mHeight = 1.84 m

Weight = 62 kgWeight = 62 kg

BMI = BMI = 62 62 = =

1.841.842 2

What it means -What it means -

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Olive OyleOlive OyleHeight = 1.84 mHeight = 1.84 m

Weight = 63 kgWeight = 63 kg

BMI = BMI = 62 62 = = 62 62 = 18.3 = 18.3

1.841.842 2 3.393.39

What it means -What it means -ALMOST ALMOST UNDERWEIGHTUNDERWEIGHT

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Nigel ThornberryNigel ThornberryHeight = 192 cmHeight = 192 cm

Weight = 105 kgWeight = 105 kg

BMI = BMI = 105 105

1.921.922 2

What it means -What it means -

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Nigel ThornberryNigel ThornberryHeight = 192 cmHeight = 192 cm

Weight = 105 kgWeight = 105 kg

BMI = BMI = 105 105 = = 105 105 = = 28.528.5

1.921.922 2 3.693.69

What it means -What it means -OVERWEIGHTOVERWEIGHT

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THE THE ENDEND