DOES SIZE MATTER? GCSE Biology By Dr H E Bloomfield © HEB.

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Presentation transcript:

DOES SIZE MATTER? GCSE Biology By Dr H E Bloomfield © HEB

People come in a range of shapes and sizes © HEB

Are these Welsh athletes OK? Gavin Henson Tanni Grey-Thompson © HEB

Are these people OK? Dawn French © HEB

Are these children OK? © HEB

Is this OK? © HEB

Health Problems Linked to Obesity Greater risk of developing high blood pressure heart disease diabetes (high blood sugar) arthritis (worn joints due to the extra pressure put on them) © HEB

Leg X-ray leg from a 23 year old person who weighs 175 kg (about 28 stones). Note the folds of skin and fat and the damage to the knee joint. The space between the thigh and shin bones should be even on both sides. The top of the shin bone is also rough. © HEB

Are these athletes OK? Paula Radcliffe © HEB

Are these supermodels OK? © HEB

Are these children OK? © HEB

Is this OK? These people have Anorexia © HEB

Any comments? © HEB

Health Problems Linked to Lack of Food Reduced resistance to infection Irregular periods and lower fertility in women People can also develop health problems (deficiency diseases) if their diet is missing a particular food group © HEB

The effects of iodine deficiency The effects of protein deficiency Is this OK? The effects of iodine deficiency The effects of protein deficiency © HEB

These children have rickets caused by a lack of Vitamin D Is this OK? These children have rickets caused by a lack of Vitamin D © HEB

Are these OK? Chantelle Ant and Dec © HEB

END OF PART 1 © HEB

BODY MASS INDEX (BMI) © HEB

Body Mass Index (BMI) is a number calculated from a person’s height and weight. It is a measure of body fatness and applies to adults over 20, not to growing children. A person can use their BMI to find out if they’re a healthy weight for their height. © HEB

Calculating Body Mass Index (BMI) BMI = Weight in kg (Height in m)2 Example If a person is 1.60 m tall and weighs 65 kg, BMI = 65 = 65 = 25.39 1.602 2.56 © HEB

What BMI figures mean BMI What it means Less than 18.4 You are underweight for your height 18.5 to 24.9 You are an ideal weight for your height 25 to 29.9 You are overweight 30 to 39.9 You are obese Over 40 You are very (or morbidly) obese © HEB

Fred Flintstone Height = 180 cm = 1.80 m Weight = 105 kg BMI = 105 = 1.802 What it means - OBESE © HEB

Fred Flintstone Height = 180 cm = 1.80 m Weight = 105 kg BMI = 105 = 105 = 32.4 1.802 3.24 What it means - OBESE © HEB

Marge Simpson Height = 1.50 m Weight = 55 kg BMI = 55 = 1.502 What it means - © HEB

Marge Simpson Height = 1.50 m Weight = 55 kg BMI = 55 = 55 = 24.4 1.502 2.25 What it means - IDEAL WEIGHT © HEB

Olive Oyle Height = 1.84 m Weight = 62 kg BMI = 62 = 1.842 What it means - © HEB

Olive Oyle Height = 1.84 m Weight = 63 kg BMI = 62 = 62 = 18.3 1.842 3.39 What it means - ALMOST UNDERWEIGHT © HEB

Nigel Thornberry Height = 192 cm Weight = 105 kg BMI = 105 1.922 What it means - © HEB

Nigel Thornberry Height = 192 cm Weight = 105 kg BMI = 105 = 105 = 28.5 1.922 3.69 What it means - OVERWEIGHT © HEB

THE END © HEB