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Diet and food production…read more

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· Heterotrophs- relying on organic substances
in our diets that have been made by plants.
· Autotrophs- using inorganic substances to
build organic substances. These substances
contain energy that originated from sunlight.…read more

Slide 3

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Carbohydrates- provides energy. Found in bread and rice etc.
Include sugars and starches; starches are better as they take
longer to digest and the energy is released more steadily.
· Proteins- formation of new cells and tissues. Found in meats,
eggs and fish. Proteins contain amino acids. This is essential for
the body as it cannot make amino acids from other amino acids.
· Lipids- making cell membranes and steroid hormones. Found in
dairy products.
· Vitamin C- making collagen. Found in citrus fruits.
· Vitamin D- formation of bones and teeth. Found in dairy foods.
· Iron- formation of haemoglobin. Found in meat, beans and
chocolate. Shortage of iron anaemia can be called.
· Calcium- bone formation and blood clotting. Found in dairy
products. Lack of calcium can cause osteoporosis.…read more

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· A diet that is seriously unbalanced.
· An obese person has an BMI of over 30.
· Obesity is caused by constantly eating
nutrients with more energy then the body
· The `spare' energy is stored in the form of fat,
which builds up as adipose tissue.
· Obesity increases the chances of developing;
heart disease, type two diabetes and arthritis.…read more

Slide 5

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Coronary heart disease
· Found in blood vessels that supply the heart with
oxygenated blood.
· The muscle uses oxygen for aerobic respiration to
make energy.
· CHD is caused by atherosclerosis in the coronary
arteries. It is sometimes known as `hardening of the
· The build up of material inside the artery walls which
blocks and makes the lumen smaller.
· Occurs naturally as part of the aging process.
· However some things encourage it more...
· High blood pressure
· Presence of harmful chemicals
· Presence of low density lipoproteins (LDLs)…read more

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Atheromatous plaque- build up of tissue and
chemicals in the artery wall.
· When the plaque has reduced the lumen by 50%
the flow of blood cannot keep up with the oxygen
requirements of the heart.
· The person experiences pain called angina.
· Blood clots can form around the plaque called
coronary thrombosis.
· The platelets come into contact with collagen in
the artery wall. The platelets secrete chemicals
that stimulate the blood to form a clot.
· Cells in the heart start to die, and this part of the
heart stops beating. This is myocardial infarction.…read more

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