Dr. Lydia Ciarallo in the Department of Pediatrics, Brown University School of Medicine, treated thirty-one asthma patients ages six to eighteen who were deteriorating on conventional treatments. One group was given magnesium sulfate and another group was given saline solution, both intravenously. At fifty minutes the magnesium group had a significantly greater percentage of improvement in lung function, and more magnesium patients than placebo patients were discharged from the emergency department and did not need hospitalization.4 Another study showed a correlation between intracellular magnesium levels and airway spasm. The investigators found that patients who had low cellular magnesium levels had increased bronchial spasm. This finding confirmed not only that magnesium was useful in the treatment of asthma by dilating the bronchial tubes but that lack of magnesium was probably a cause of this condition.5 A team of researchers identified magnesium deficiency as surprisingly common, finding it in 65 percent of an intensive-care population of asthmatics and in 11 percent of an outpatient asthma population. They supported the use of magnesium to help prevent asthma attacks. Magnesium has several antiasthmatic actions. As a calcium antagonist, it relaxes airways and smooth muscles and dilates the lungs. It also reduces airway inflammation, inhibits chemicals that cause spasm, and increases anti-inflammatory substances such as nitric oxide.6 The same study established that a lower dietary magnesium intake was associated with impaired lung function, bronchial hyperreactivity, and an increased risk of wheezing. The study included 2,633 randomly selected adults ages eighteen to seventy. Dietary magnesium intake was calculated by a food frequency questionnaire, and lung function and allergic tendency were evaluated. The investigators concluded that low magnesium intake may be involved in the development of both asthma and chronic obstructive airway disease.