A: Human blood contains a red pigment called haemoglobin which carries oxygen into the lungs and to different parts of body. For making haemoglobin red, strong and healthy, it chiefly needs iron, folic acid, vitamin C, protein and vitamin B12 – these are essential nutrients which our body cannot make on its own and need to be taken in our food, deficiency of these nutrients in diet leads to decreased concentration of haemoglobin making it thin and pale in colour. When haemoglobin concentration is lower than the levels considered normal for the persons age and sex groups this is called Anaemia. Decreased haemoglobin concentration leads to less supply of oxygen to different parts of the body which results in the malfunctioning of body cells and organic systems. Out of all these nutrients, Anaemia due to deficiency of iron is more common. Among all Anaemia, iron deficiency Anaemia is found in more than 50 per cent of the cases. Anaemia, like fever is a manifestation, not a disease, the most common cause being iron deficiency. The other causes are deficiency in other vitamins and minerals such as vitamin A, B, folic acid and zinc, malaria and worm infections.