Recall sources and describe functions of carbohydrate, protein, lipid (fats and oils), vitamins A, C and D, and the mineral ions calcium and iron, water and dietary fibre as components of the diet.
A- The function of Vitamin A is to produce light sensitive pigments in our eye and this allows us to see in poor light conditions. The source for Vitamin A are fish liver oils and liver oil. Deficiency of Vitamin A can lead to poor sight in poor light conditions which is a condition known as night blindness.
C- The function of Vitamin C is allowing the body to form connective tissue which helps cells stick to each other so that cells can stay together as a tissue. The source of Vitamin C comes from citrus fruits such as oranges, limes etc and the deficiency disease is called scurvy and the symptoms of scurvy are bleeding gums.
D- Vitamin D allows us to absorb calcium from our diet. Vitamin D can be produced by our body itself while under sunshine or you can obtain it from fats, eggs or fishes. The disease that occurs if you don't obtain enought Vitamin D is called richets and which can be determined by the bending of bones.
Calcium-You can obtain calcium through dairy products such as milk, cheese etc. The function of calcium is increasing bone strength and a lack in calcium can also cause richets.
Iron- We can find iron in food in liver and the famous vegetable spinach. The function of Iron is the synthesis to make the haemaglobin which we find in red blood cells and that carries oxygen. If you lack Iron in your diet and results in a condition called Anaemia. People with Anaemia looks pale and gets tired quickly.
Fibre is a plant's cell wall, this means it's the cellulose. We get these from plants from our diet. A lack in fibre can cause what we know as constipation. The main role of fibre is peristalsis in our gut.
The function of water is to produce solutions and in those solutions there is the chemistry of life. Substances dissolve and substances react in these solutions. We can obtain water through drinking directly or it may be inside the food inside. If we lack water we will be dehydrated.