Diet What does Diet actually mean New Topic

Diet What does ‘Diet’ actually mean?

New Topic: Diet Learning Objectives: 1. Pupils will be able to define the term “diet” 2. Pupils will begin to understand how diet can affect performance Key Words: Diet, energy balance, Kilocalories/kilojoules, natural body build, obese, overweight.

Diet –Task 1 Ø Why Ø List do people diet? as many different reasons as you can for dieting.

DIET – The Definition Diet is a word that is often misused. It can be described as: “The normal food we eat” Special diets – to lose weight, to gain it, diets due to moral values or diets because of food intolerance Weight loss - concerned with energy balance. We need energy to produce muscle contractions and for the growth and repair of tissues

Joules and Calories Energy can be measured using joules or calories, but these are defined differently: JOULE = Energy needed when 1 KG is moved 1 M by the force of 1 newton (N) CALORIE (cal) = Energy needed to raise the temp of 1 gram of water by 1 degree (from 14. 5 -15. 5 degrees)

Calories and Joules When large units are involved, as with diets the terms kilojoules (KJ) is used or megajoules (MJ) (1 million Joules) When calories are used in large quantities the term kilocalorie (kcal) is used ENERGY BALANCE This means taking in (eating) and using up through work, exercise etc. and equal number of calories or Kcal. We all have our own unique metabolism or rate of using up energy – this is called METABOLIC RATE What does this explain? Some people can eat less food but put on weight whereas others appear to be able to eat as much as they like without putting on any weight.

Losing Weight The Three Methods: 1. Decreasing Kilocalarie intake 2. Increasing Kilocalarie Energy Expenditure 3. A Combination of Both. Which do you think is best? Most People – 3 rd - Giving the best results and being the most long lasting.

Overweight, Overfat, Obese Charles Corbin defines them as: Overweight: having weight in excess of normal. Not harmful unless accompanied by overfatness Overfat: Having too much body composition as fat; men having more than 19% of total body composition as fat; for women 26% Obese or obesity: Extreme overweight often considered as 20 -35% above normal – best described as an extreme over fat condition

Obesity in Australia In Australia we only use two terms, overweight and obese and research has shown that problems with adults who are overweight or obese has increased in Australia in recent years, Health risks such as, the risk of cancer and coronary heart disease (CHD) – including heart attacks and strokes as well as high blood pressure. Studies have shown that the problem is even worse with children – why is this?

Factors affecting an individual’s diet l Natural Body Build l Particular Sport l Position They Play

Assignment / Power Point l Choose 2 people from different sports or events, such as athletics, rugby league, soccer, AFL, swimming, basketball etc. l Sports require more or less energy than others. – Use pictures of the sports people. – Compare them and explain why they need to use more or less energy.