Vitamin B12 is only found in meat, fish, eggs and milk, although it is sometimes added to cereals and margarines. It is vital for the formation of red blood cells and nerve fibres. If our bodies don't produce enough red blood cells this can lead to iron deficiency known as anaemia. Two-thirds of protein comes from meat, fish, eggs and dairy food.
However, protein can also be found in cereal products, nuts and pulses. Recent studies show most of us eat more protein that we need. The recommended intake is 45 grammes for women and 55 grammes for men. Iron from animal sources is more easily absorbed than iron from plant sources. This is because various substances contained in iron from plant sources can bind iron, reducing absorption.