Minerals and trace elements


In addition to water and organic materials (macronutrients), food also contains minerals. Around twenty minerals are essential for humans, and are split into 2 categories:

· Major minerals or macroelements: calcium (Ca), chlorine (Cl), le magnesium (Mg), phosphorus (P), potassium (K) and sodium (Na)
>Food with high level of calcium (pdf - only in French)
>Food with high level of magnesium (pdf - only in French)
>Food with high level of phosphorus (pdf - only in French)
>Food with high level of sodium (pdf - only in French)

· Trace elements which include arsenic (As), boron (B), chromium (Cr), cobalt (Co), copper (Cu), iron (Fe), fluorine (F), iodine (I), manganese (Mn), molybdene (Mo), nickel (Ni), selenium (Se), silicium (Si), vanadium (V) and zinc (Zn)
>Food with high level of iron (pdf - only in French)
>Food with high level of selenium (pdf - only in French)
>Food with high level of zinc (pdf - only in French)

Other trace elements (aluminum, cadnium, mercury, lead) can be found in our body as a result of different types of contamination (food, air). Their biological effects are limited to their toxicity.

The quantities of minerals in the body are very variable: almost 1 kg for calcium and phosphorus, a few grams for iron, zinc and fluorine and less than 1 mg for chromium and cobalt. In total, minerals make up around 4% of our body weight, but are involved in a large number of functions: mineralisation, controlling water balance, enzymatic and hormonal systems, muscular, nervous and immune systems. For example, thyroidian hormones cannot be made without iodine, haemoglobin without iron and no muscular contraction can occur without calcium, potassium or magnesium. Except for iodine, fluorine and cobalt, all of the mineral elements play multiple roles.

Daily intake of minerals compensates for inevitable loss, and a balanced and varied diet guarantees correct intake. Mineral elements are water soluble, which is why there is a certain amount of loss depending on how food is prepared.

Nutritional composition of foods
Protien
Carbohydrates
Fat
Vitamins
Minerals
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Opinions and/or reports related to this topic (mainly in french) :
Iron
Calcium
Some minerals
L iode
Human food
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