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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
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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
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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:
type 2 diabetes,
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
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
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
Lipids (fats):
Essential part of the diet.
Saturated fats and unsaturated fats
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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This is a really good presentation !!!!
Thank you :)

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