Mineral

Functions

Sources

Signs of
Deficiencies

Signs of
Excessive Intake

Magnesium (Mg)

Essential for healthy bones;
Functioning of muscle & nervous tissue;
Needed for functioning of approx. 90 enzymes.

Eggs;
Green leafy vegetables;
Fish (esp. shellfish);
Milk (and dairy products);
Nuts;
Wholemeal flour.

Deficiency can occur gradually, leading to:
Anxiety; Fatigue; Insomnia; Muscular problems; Nausea; Premenstrual problems.
The most extreme cases of deficiency may be associated with arrhythmia.

Unusual.