They may not be eating enough:
A 9-year-old should consume 1,400 to 2,200 calories daily to sustain growth, said Dr. Roberto Trevino, director of the nonprofit Social and Health Research Center. But in the study of 1,400 inner-city children, 44 percent were consuming less than 1,400 calories, and 33 percent were obese. "They were not overeating," Trevino said. "This study shows these kids were not eating enough, and when they did eat it was all the wrong things." Missing from the children’s diets were four key nutrients: calcium, magnesium, potassium and phosphorus. All play important roles, but magnesium is involved in more than 300 enzymatic reactions in the body that help to spur metabolism and cell function.