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Nutrition
Nutrition: is nourishment ­ the nutrients and energy needed for health
and growth
Good nutrition:
Ensures stronger immune system
Make you ill less often
Makes you more productive
Helps you learn more effectively
Balanced diet: contains all the nutrients needed for health in the right
proportions
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Macronutrients & Micronutrients
MACROnutrient Functions
Carbohydrates Provide us with energy; broken down into glucose; used in cellular
respiration; converted into glycogen, excess converted into lipids;
Proteins Essential for growth and repair; broken down into amino acids;
Lipids (fats) Source of energy; make up plasma membranes; used for waterproofing;
help in absorption of fat-soluble vitamins
MICROnutrient Functions
Vitamins Used in chemical processes in cells; some are water-soluble, some are
fat-soluble (e.g. Vitamin C is needed for skin, bones, vessels)
Minerals Inorganic elements essential to the body's normal functions (e.g.
Calcium ­ teeth & muscles, Iron ­ haemoglobin)
Fibre (roughage) Indigestible, but aids movement through gut, holding water and
providing bulk for intestines to work on
Water Essential to body function; used in transporting substances around the
body
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Obesity
Obesity: when a person is 20% or more heavier than the recommended
weight for their height.
Obesity is caused by consuming too much energy
Obesity-related diseases:
Cancer
type 2 diabetes,
gallstones,
high blood pressure (hypertension)
Malnutrition: having too little or too much in your diet
Basal Metabolic Rate: the energy needed to keep your metabolism `ticking
over' ­ falls with age as tissue is replaced less and muscle mass is lost
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Diet & Disease
Disease: a departure from good health caused by a an
malfunction of the mind or body. Usually has signs and
symptoms.
Calculating the risk of developing a disease:
no. of people with disease at any one time
Total no. of people who could develop disease
Risk factor: anything that increases the chance of
developing a disease
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Components of the diet
Salt:
Excess salt in the diet decreases the water potential of the blood.
Blood pressure increases = hypertension
Hypertension damages the endothelium of the arteries and initiates
atherosclerosis
Lipids (fats):
Essential part of the diet.
Saturated fats and unsaturated fats
Cholesterol:
Lipid molecule found in plasma membranes
Made in the liver from saturated fats
Controls fluidity and is insoluble in the blood
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Comments

Ellen

This is a really good presentation !!!!
Thank you :)

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