They include sugars and starches, which provide us with a ready source of energy that is easily respirated. The simple sugars are absorbed by the stomach into the blood to give a source of energy.
Good sources of carbohydrates are rice, potatoes, bread, yams, sugar and honey
We need it to make new cells. We digest protein into amino acids and then we used this to make our own proteins. There are 20 different types of amino acids and we have to had all of them. Proteins have several functions: the growth, to have energy...
Good sources are meat, fish, milk and nuts.
They are important as a long-term energy store. They are under the skin and around the heart and kidneys.
They are good thermal insulators.
Good sources are butter, cheese, fat in meats and fish, nuts...
Water makes up two-thirds of our body mass. It´s needed for chemical reactions to take place in solution. The blood transports substances dissolved in water. Waste chemicals are passed out of our bodies in solution in the urine, and water in our sweat cools us down.
Rich food source:
oranges, lemons and other citrus fruits.
Use in body:
Tissue repair, resistance to disease.
bleeding gums (scurvy).
Fish oil, milk, butter (also made by the skin in the Sun).
Strengthens bones and teeth.
Soft bones, legs bow outwards (rickets).
Rich rood source:
Liver, meat, cocoa, eggs.
Used in formation of haemoglobin in red blood cells for transport of oxygen.
Tiredness, lack of energy (anaemia).
Milk, fish, green vegetables.
Weak, brittle bones and teeth (rickets), muscle weakness and cramps.
It comes from plants. It is made up mainly of cellulose from plant cell walls. It cannot be digested. High-fibre foods include bran cereals, cabbage, sweetcorn and celery.
Fibre can´t be digested (it passes down the entire gut from mouth to anus and does not provide any energy).
It reduces the risk of heart disease and bowel cancer.