Keeping healthy
- Created by: carmen.lau
- Created on: 14-06-15 13:01
Why do we need food?
We need food for energy- movement, growth etc
Unhealthy choices:
- Not eating enough fruit & veg- Unbalanced diet, Not enough vitamins
- Not drinking enough water- Become dehydrated, Frequent headaches
- Eating too much fatty food- Overweight, Unbalanced diet, Risk of heart diease/ strokes
- Not excerising enough- Overweight, Heart problems, Poor digestion
- Not eating enough- Lack of energy, Malnutrition, Deficiency dieases
Metabolic rate: The rate of the chemical reactions that happen inside cells. This is affected by:
- Proportion of muscle to fat
- Amount of exercise/ activity
- Inherited characteristics
People who exercise regulary need more food because they need more energy. When you exercise, muscle builds up, meaning your metabolism is faster. Exercisng uses up energy, meaning you need more (energy) to carry out basic needs
How is Exercise Beneficial?
BMI = Mass / height
This gives an INDICATION of whethe you are underweight or overweight for your height.
Obesity: When someone is has a large amount of body fat, or is ove the healthy weight range for their height. This can lead to:
- Diabetes
- Strokes / Heart problems
- Excess cholesterol
Starvation:
- You cannot get enough food to feed your body
- You dont have enought energy, can become underwight, develop deficiency diseases etc. Females may not get periods
- Anorexia has the same symptoms as starvation
- People can develop anorexia by wanting to lose weight by extreme dieting and eventually, not mentally be [able] to eat.
What Affects how much Energy you Need?
Age:
- People that are growing (Children and teenagers) need more energy to grow
Gender:
- Males usually have a higher muscle to fat ratio so need more energy
Amount of exercise:
- More exercise means that you use up more energy
- More exercise can lead to more muscle ( higher muscle to fat ratio)
Pregnancy:
- The mother is feeding for 2 people
- The baby is rapidly growing
Temperature:
- If you are too hot / cold, you need more energy to stay the right temperature
Deficiency diseases
Rickets:
- Lack of vitamin D- sunlight, eggs, fish etc
- Vitamin D controls amount of calcium in bones
Scurvy:
- Lack of vitamin C- citrus fruits
- Vitamin C makes collagen, a protein in blood
Anaemia:
- Iron deficiency- red meat, nuts, leafy veg etc
- Lack of hemoglobin- pale skin, no energy
Infectious Diseases
Viruses: Measles, Mumps, Chicken pox etc
Bacteria: TB, Salmonella etc
Fungi: Athlete's foot, Ringworm etc
Bacterial infection: Virus infection:
Pathogens enter the body
- Bacteria rapidy reproduce ( Binary fission) Viruses insert their DNA into a host cell's DNA
- Bacteria produce toxins, which make you ill The host cell makes more copies of the virus
- The new viruses burst out of the host cell, killing it
The toxins/ dead cells & immune system cause symptoms
Ignaz Semmelweis // Pathogens
- Hungarian physician, 1818-1865
- Showed that hand washing could reduce the amount mothers dying of childbirth (and other patients)
- Enforced strict hand washing rules & drastically reduced the number of dying patients
////
How do pathogens invade our bodies?
- Mouth- food
- Ears- droplets
- Cuts/ wounds & infections- bacteria
- Animal bites
- Direct contact- sex
Treating Diseases & Problems
Antibiotics kill bacteria
Painkillers only treat the symptoms
Side effects of vaccines:
- A study was released saying that the MMR vaccine would give your child autism
- A large percentage of parents didnt get their child/ren vaccinated
- When the disease went round, many children got ill and some were close to dying
- Eventually, other research showed that the first study was biased and untrue
Epidemics/ Pandemics:
- People from all over the world travel to other countries around the world
- Some people may catch a disease from a country and spread the disease when they go to another country
Antibiotic Resistance
- When you catch a bacterial disease, a few of the bacteria might mutate, making them resistant to an antibiotic.
- When the antibiotic is given, the mutated bacteria still survive & can breed & multiply.
- The new mutated bacteria is resistant
MSRA:
- This is a disease that is resistant to most antibiotics
- It only affects very ill people
- Causes big problems in hospitals
- It has become resistant by being surrounded by many types of antibiotic all the time
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