Diet and Exercise
Food provides the energy that your body needs to carry out activities, both internal and external. Everybody needs food to survive, whether its sushi or roast chicken, most people do eat varied diets that includes everything you need to stay healthy.
If you exercise you will need more energy. Exersice increases the metabolic rate, this is the rate at which your body uses energy needed to carry out chemical reactions.
If it's warm you will need less energy than when its cold. The amount of energy you need depends on:
- your size
- your sex
- amount of exersice you do
- outside temperature, if its cold you'll need lots of high energy fats to keep warm.
If you take in more energy/food than you need you will become fat. If you're very fat your said to be obese. Obese people are likely to suffer from:
- Arthritis (worn joints)
- High blood pressure
- Heart disease.
If you have less energy/food than you need you will loose weight. In developing countries some people have health problems linked to too little food. These include reduced resistance to infections and irregular periods in women.
These people are malnourished because they do not have a balanced diet.
Fast food can contain too much salt and fat. Too much salt can lead to increased bllod pressure.
Cholesterol is made in the liver and the amount depends upon diet and inherited (gentic) factors. We need cholesterol, but too much in the blood leads to an increased risk of disease of the heart and blood vessels. Two types of lipoproteins carry cholesterol around the body:
- Low density lioporotiens (LDLs), which are bad and can cause diseases.
- High denisty lioporotiens (HDLs), which are good for you.
Saturated fat in your diet increases your cholesterol level. Mono-unsaturated and polyunsaturated fats help to reduce cholesterol levels. We can use statins to stop the liver producing too much cholesterol.
REMEMBER: your metabolic rate is the rate your cells turn food to energy.