Chapter 13 Vitamins and minerals
Reference Values
There is now a move to change all these, amalgamating them into the dietary reference intake (DRI), which takes into account the above values.
People at Risk from Deficiencies
Any condition of the gastrointestinal tract that reduces absorption can put the individual at risk of a vitamin deficiency (see Chapter 15 ‘Methods of administration’, p. 119). Other causes include:
Metals
Two Important Elements
Magnesium
Thus adequate levels of magnesium in the body are important.
• Facts about Magnesium
Calcium
• Interaction of Food Substances with Calcium
Calcium is absorbed along the entire length of the gastrointestinal tract. Absorption can be affected by:
Trace Elements
Iron
Iron is essential to plants and animals and is usually found incorporated in a protein complex called a haem, where it forms the nucleus of the haem complex. This complex is an essential component of:
• When can Iron Deficiency Occur?
For symptoms of iron deficiency anaemia, see Chapter 28 ‘Blood disorders’ (p. 209).
• Sources of Iron
Haem iron is absorbed much more easily than non-haem iron. Only 1–7% of non-haem iron is absorbed when eaten on its own. Non-haem iron absorption can also be decreased by the following:
There are, however, ways of increasing non-haem absorption:
Copper
Copper is a cofactor in various metabolic processes:
• Copper Deficiency
Blood disorders (see Chapter 28 ‘Blood disorders’, p. 209 and Chapter 41 ‘Scientific tests’, p. 331):

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