By Diane Carman While some researchers are celebrating what they see as a new, positive trend toward declining obesity rates among low-income preschool children in a report released this week, James O. Hill is skeptical. Too many toddlers are obese, said Hill, executive director of the Anschutz Health and Wellness Center. Thats the bottom line. These are very tiny numbers that are bouncing around, he said. I struggle to say there are any real trends here. The report, Vital signs: Obesity Among Low-Income, Preschool-Age Children United States, 2008-2011, by the Centers for Disease Control and Prevention found that small but…