Bariatric Surgery Side Effects; Obesity affects more than 1 in 3 adults in the United States. About 1 in 6 children and adolescents ages 2 to 19 are considered to. Childhood obesity is a major risk factor for adult obesity and it's associated with chronic killer diseases. This blog tells you about the ways to prevent childhood obesity. Adult and childhood obesity have increased substantially in the last 30 years. Currently, 35% of adults ( million) and 18% of children 2 to 19 years old ( million) are obese, as defined by their body mass index.