Diet and exercise

what is a healthy diet?
the right balance of the different foods you need and the right amount of energy
what is it called when you dont have a balanced diet?
if you dont have a balanced diet, you are said to be malnourished
SO What Are The Different Types Of Things You Need In Your Diet? ....

carbohydrates

Carbohydrates are needed to release energy

Fats

Fats are needed to keep warm and to release energy

protein

Protein is needed for growth, cell repair and cell replacement.

fibre

Fibre is needed to keep everything moving smoothly through your digestive system

Vitamins and minerals

Tiny amounts of various vitamins and mineral ions are needed to keep your skin bones blood and everything else generally healthy.

Energy needs

People you need energy to fuel the chemical reactions in the body that keep you alive.
These reactions are called your metabolism and the rate at which they occur is your metabolic rate.
There are slight variations in the resting metabolic rate of different people

for example, muscle needs more energy than fatty tissue which means (all other things being equal) people with a higher proportion of muscle to fat in their bodies will have a higher metabolic rate
another factor is how physically big you are, the bigger you are, the more cells you have so therefore the mrs energy you need.
men tend to have a higher rate than women because they tend to be bigger and have a higher proportion of muscle
regular exercise can boost your metabolic rate because it builds muscle

What happens if your diet is not balanced?

People whose diet is badly out of balance are said to be malnourished - malnourished people can be fat or thin or unhealthy in another way
Eating too much:

excess carbohydrate or fat in the diet can lead to obesity
obesity is a common disorder in developed countries - its defined as being : 20% or more over maximum recommended body mass
hormonal problems can lead to obesity although the usual cause is a bad diet, overeating and a lack of exercise.
health problems that can arise as a result of obesity include : arthritis (inflammation of the joints), type 2 diabetes (inability to control blood sugar level), high blood pressure and heart disease, it is also a risk factor for some kinds of cancer.
too much saturated fat in your diet can increase your blood cholesterol level
eating too much salt can cause high blood pressure and heart problems

eating too little

eating too little:

not getting enough excercise

exercise is important as well as diet- people who exercise regularly are usually healthier than those who dont
exercise increases the amount of energy used by the body and decreases the amount sited as fat. it also builds muscle so it helps to boost your metabolic rate. so people who exercise are less likely to suffer from health problems such as obesity
however, sometimes people can beg fit but not healthy. e.g. you can be physically fit and slim but malnourished at the same time because your diet isn't balanced

Inherited factors

its not just about what you eat and how much exercise you do - your health can depend on inherited factors too
some prop;le may inherit factors that affect their metabolic rate e.g. an under active thyroid gland which can lower the metabolic rate and caue obesity
other people may inherit factors that affect their blood cholesterol level
cholesterol is a fatty substance thats essential for good health - it is found in every cell in the body. some inherited factors increase blood cholesterol lebel which increases the risk of heart disease

how do people lose mass

people ose mass when the amount of energy they take in is less than the amount of energy they use up
exercise increases the amount of energy expended by the body

slimming claims

there are loads of slimming claims that aren't scientifically proven.
look out for these things:

is the report a scientific study, published in a reputable journal
was it written by a qualified person
was the sample of people asked or tested large enough to give reliable results
have there been other studies which found similar results

really all you need to do to lose weight is to take in less energy than you use so diets and slimming products only work if you:

eat less fat or carbohydrate (so you take in less energy) or
do more exercise so you use more energy

some claims may be true but a little misleading e.g. low fat bars might be low in fat but eating them without changing the rest of your diet doesn't necessarily mean that you'll lose weight - you could still be taking in too much energy

GCSE Biology (unit 1) Slide Set on health and diet, created by janey.efen on 28/02/2016.

0 comments