Magnesium: physiological functions and relevance to health

Magnesium is an essential mineral involved in multiple physiological processes in the human body. Although it doesn't always receive the same attention as other micronutrients, it plays an important role in metabolic, neuromuscular and energy regulation. Maintaining adequate levels of magnesium is associated with the normal functioning of various systems in the body.

Biological functions of magnesium

Magnesium takes part in hundreds of biochemical reactions and is involved in fundamental processes such as:

• Energy metabolism, through the synthesis and utilisation of ATP (adenosine triphosphate), the main energy molecule in cells
• How mitochondria work
• Protein synthesis
• Nerve transmission
• Muscle contraction and relaxation

At the cellular level, magnesium is necessary for the activation of reactions that allow energy to be produced and utilised, and is an indispensable cofactor in multiple metabolic pathways.

Magnesium and metabolic and cardiovascular health

Scientific research has associated adequate levels of magnesium with better regulation of blood pressure and a more balanced cardiovascular function. This mineral plays a role in regulating vascular tone and cardiac electrical conduction.

At the metabolic level, magnesium is involved in insulin action. Adequate values have been associated with greater insulin sensitivity, while deficient states have been observed more frequently in people with glucose metabolism disorders, including type 2 diabetes.

Magnesium's role in bone health

In addition to calcium, magnesium contributes to the formation and maintenance of bone structure. It participates in bone mineralisation and the regulation of calcium and vitamin D metabolism. Prolonged magnesium deficits have been associated with changes in bone mineral density and greater bone fragility.

Magnesium, nervous system and response to stress

Magnesium plays an important role in regulating the nervous system. It is involved in modulating neuronal excitability and neurotransmitter function. Deficit states may be associated with greater reactivity to stress, mood swings, fatigue and difficulty relaxing muscles.

The proper regulation of magnesium contributes to the balance between the excitatory and inhibitory systems of the nervous system, influencing the response to stress and the body's ability to adapt.

Food sources of magnesium

The main source of magnesium should be food. Foods naturally rich in this mineral include:

• Green leafy vegetables such as spinach, chard and kale kale
• Other vegetables, such as beetroot and broccoli
• Nuts and seeds, particularly almonds, cashew nuts and pumpkin seeds
• Foods of marine origin, such as blue fish, mussels, cockles and prawns
• Fruits such as avocados, bananas and raspberries
• Cocoa, naturally rich in magnesium

A varied and unprocessed diet tends to favour a more adequate intake of this micronutrient.

Clinical considerations

Magnesium needs can vary from person to person, depending on their state of health, their level of stress, physical exercise, diet and other metabolic factors. In some clinical contexts, it may be pertinent to assess magnesium intake or status as part of an overall assessment.

The approach to magnesium should always be integrated into an individual clinical assessment, taking into account the physiological context and the other factors that influence the body's balance.