Obese children can develop signs of heart abnormalities as young as age 8, which might drive up their risk for early death as adults, new research suggests. “It is both surprising and alarming to us that even the youngest obese children in our study who were 8 years old had evidence of heart disease,” said study lead author Linyuan Jing, a postdoctoral fellow with Geisinger Health System in Danville, Pa.