When the body is pushed to its limits in order to deal with stress, one of the most largely-used resources is MAGNESIUM. The categories at risk are mainly women (due to ion losses connected with menstruation), children and the elderly. Any individual who is repeatedly subject to stress can have a reduced cell availability of Magnesium. Diets in industrialised societies are increasingly sodium-rich and POTASSIUM deficient, both because of the high sodium content of food and of the higher induced depletion of potassium. ZINC deficiency is associated with a reduced immune response, which is already low in case of chronic stress. The simultaneous presence of the three cations (Magnesium, Zinc and Potassium) is required to catalyse more than 300 reactions in the body, including the Krebs cycle, the main metabolic cycle used by our cells to produce energy. Excessive sweating, typical of the warmest periods of the year or in case of physical efforts, can further deprive our body of minerals.