Nutrition and Health AQA 11.2 b1a gcse
Diet - the basics Healthy diets are balanced in the context of • Proteins – build muscle and cells • Carbohydrates- starch and sugars - energy • Fats and oils – cell membranes and energy • Minerals and vitamins - health • Fibre – helps food move through the intestine • Water – hydration of the body
Health and Body image What factors influence how we see ourselves? Advertising? Models, film stars or famous people? Popular music culture Who are most vulnerable to images of so called ‘desirable’ body shape and size?
Lack of food and health problems • Deficiencies – there are so many you don’t need to know any – (Scurvy – lack of vitamin C is one) BUT you must know that ‘starvation’ causes: • Reduced resistance to disease. • Irregular periods in women -
Obesity • How would you describe an obese person? • Where does being overweight stop and obesity start?
Obesity – is also malnutrition However it can be linked to a persons genes, some families are more likely to become overweight without careful dietary control, particularly when linked with poor exercise routine
TOO MUCH FOOD AND TOO LITLE EXERCISE WILL LEAD TO • Arthritis – worn joints • Diabetes – high blood sugar level • High blood pressure • Heart and blood vessel disease (cardiovascular)
A question of balance To maintain your weight Energy intake = energy output Does a bricklayer need to eat more than a teacher? Do Eskimos need to eat more high energy foods than us?
Body mass index Doctors can assess whether people are obese using BMI – however it is not totally reliable. What is your BMI? BMI Categories: • Underweight = <18.5 • Normal weight = 18.5-24.9 • Overweight = 25-29.9 • Obesity = BMI of 30 or greater BMI = weight Kg ÷ height2 m2
Fast foods • High in fats and salt – not good if eaten to excess.
Diets – which do you choose? G.I diet F-plan Atkins Weight watchers and the rest