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Food and Nutrition Notes and summaries

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Detailed notes and summaries on food and nutrition for grade 12 consumer studies from a top consumers student who achieved an A in both grade 11 and grade 12. This notes cover all that you need to know including nutrition, food, dietary diseases and food Bourne illnesses. These notes are guaranteed to get you a good mark for your Consumers exams!

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OESTEOPOROSIS
A disease of weak and brittle bones
 Reduced bone density and quality
 Decrease in bone mass and density
 Porous and fragile bone increase risks of bone fracture
 Fractures can lead to injury or death
 Common fractures: spine, hips, wrists
 Due to an excessive loss of protein and minerals especially calcium
Bone
 Living tissue made of collagen fibres and minerals
 Collagen synthesis requires protein and Vitamin C
 Minerals such as calcium form a hard structure
 Body breaks down, reabsorbs and replaces old tissue
 This process slows down with age
 Bones become thinner, less dense, brittle, weak
 Bones stop growing in length between 16-18 years
 Peak bone mass is reached at 25-30 years
Peak bone mass: the maximum amount of bone mass achieved in a lifetime

Causes of osteoporosis
 Factors in achieving bone mass: genetic, nutrition, physical activity
 Optimise peak bone mass in youth
 After 30 irreplaceable calcium is lost and cannot be replaced
 Cannot replace tissue as quickly as you lose it
 Bone tissue loss increases after menopause
 Oestrogen production stops and bones no longer benefit from protective
effect
 Low fat tissue results in poor oestrogen production

Why do women suffer more than men?
 More the 1/3 over the age of 50 are affected
 Nearly 1/2 of those over 70 are affected
 One in 5 men will develop this disease
 Men have higher bone densities
 Smaller and thinner bones
 Oestrogen protects bones when young
 After menopause oestrogen levels decrease sharply
 Bone tissue/density loss increases

Signs and symptoms
 Back pain due to cracked or broken vertebra
 Decrease in body height
 Stooped or bent posture
 Bone fractures from mild injury
 Bone density scans

Risk factors
 Low calcium intake (essential for strong bone formation)
 Dietary factors (too little vitamin D, magnesium, phosphorous
 Inadequate physical activity (require exposure to weight bearing exercise)
 Certain drugs (corticosteroids – interfere with calcium absorption)
 Family history of the disease

,  Small boned, low body mass
 Smoking inhibits absorption of vitamin C
 Heavy alcohol, caffeine or soda intake prevents calcium absorption
 Anorexia (lower bone mass density)
 Hyperactive thyroid

Dowagers hump
 Weakened bone collapse’s under body’s weight
 Compression fractures occur in the spine
 Loss of height
 Increased curvature of the spine
 Stooped posture
 Often visible in the elderly


Prevention
› Recommended daily intake: 1000-1500mg
› Milk and milk products are the best sources
› Adults should have 400ml of milk per day
› Calcium is absorbed less with age
› Increased milk consumption is beneficial
High Calcium › All milk types and yoghurt have similar content
Intake › Green leafy vegetables, tinned fish and nuts are also
good sources
Especially recommended for:
› Children and adolescents
› Breastfeeding women
› Post-menopausal women
› Important for post-menopausal women
› Replaces missing oestrogen with hormone
Hormone
supplement
Replacement
› Slows down the loss of calcium
Therapy
› Reduces bone density loss
› Early menopause (before 45) can cause osteoporosis
› Excessive weight loss
Avoid Bad › Alcohol and caffeine abuse
Lifestyle Habits › Smoking
› Interferes with calcium absorbtion
› Stimulate bone formation
› Reduce bone loss
Regular Exercise › Weight bearing exercises
› Best exercise: cycling, jogging, dancing, or brisk
walking
› Vitamin C forms natural collagen
› Vitamin D helps absorption of calcium and
Sufficient Vitamin phosphorous
and Mineral Intake › Vitamin D sources: oily fish, salmon, egg yolk, milk,
sunlight, tuna
› Phosphorus and magnesium
Increase Fluoride › Found in fluorinated water
› Ensures rapid absorption by bone minerals

, › Helps strengthen bones
RICKETS
The softening and weakening of bones
 In children
 Softens areas of growing tissue at bone ends
 Causes skeletal deformities
 Extreme and prolonged vitamin D deficiency
 Osteomalacia: rickets in adults

 Vitamin D deficiencies are common in developing countries
 Vitamin D, calcium and phosphorous work together
 Necessary to build strong bones and teeth
 Without proper nutrients the body can become malnourished and
deformed


 Diagnosed with blood tests and x-rays
 Treatable by a medical professional
 Treatment: adding vitamin D or calcium to the diet, medication, surgery


Signs and symptoms Complications if left untreated
 Delayed growth  Failure to grow
 Delayed motor skills  Abnormally curved spine
 Pain in spine, pelvis, legs  Bone deformities
 Muscle weakness  Dental defects
 Bowed legs or knock knees  Seizures
 Thickened wrists or ankles
 Breastbone projection


Source of vitamin D: sunlight Source of vitamin D: food
Skin produces it when exposed to sunlight Found in fish oil, egg yolks, salmon and
(10-15mins) but children in developed fatty fish and has also been added to
countries spend less time outdoors and wearsome foods and beverage such as milk
sunscreen which blocks rays and cereal and fruit juices (fortified)

Risk Factors
 Dark skin (pigment melanin lowers skin’s ability to produce vitamin D from
sunlight
 Vitamin D deficiency during pregnancy
 Northern latitudes (geographical locations with less sunlight)
 Premature birth (less time to receive vitamin D in the womb)
 Medications (anti-seizure, antiretroviral interferes with ability to use
vitamin D)
 Exclusive breast feeding (breast milk does not contain enough vitamin D)

, CONSTAPATION
Infrequent bowel movements
 Fewer than 3 bowel movements a week
 Faeces become hard, lumpy, compacted, dry
 Faeces move too slowly through the digestive tract
 Effort is needed to remove faeces effectively from the rectum
 Hard faeces are painful to pass


Symptoms Risk factors
 Lumpy or hard stool  Being an older adult
 Passing fewer than 3 stools a week  Being a woman (especially
 Straining to have bowel movements pregnant)
 Feeling a blockage in the rectum  Being dehydrated
 Cannot fully empty rectum  Low fibre diet
 Needing help to empty rectum  Little or no physical activity
(hands to press on abdomen)  Mental health conditions
 Certain medications

Complications

Hemorrhoids Swollen/inflamed veins in your anus

Straining to have a bowel movement may cause swelling in
the veins in and around your anus.



Anal fissures Torn skin in your anus

A large or hard stool can cause tiny tears in the anus.

Fecal Stool that can't be expelled
impaction
Chronic constipation may cause an accumulation of
hardened stool that gets stuck in your intestines.

Rectal prolapse Intestine that protrudes from the anus
Straining to have a bowel movement can cause a small
amount of the rectum to stretch and protrude from the anus

Diverticular Small, bulging pouches develop in the digestive tract
disease
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