See our Drug-Induced Nutrient Depletion Chart here: <a href="http://www.invitehealth.com/drug-induced-nutrient-depletion.html">http://www.invitehealth.com/drug-induced-nutrient-depletion.html</a> Signs of magnesium deficiency include appetite changes, nausea and vomiting, lack of energy and weakness, mood changes, numbness and tingling, and muscle problems such as tension, cramps, and contractions.