70% of obese children had at least one CardioVascular Disease risk factor and 39% had two or more

Childhood obesity can have a harmful effect on the body in a variety of ways. Obese children are more likely to have :

• High blood pressure and high cholesterol, which are risk factors for cardiovascular disease (CVD). In one study, 70% of obese children had at least one CVD risk factor, and 39% had two or more.
• Increased risk of impaired glucose tolerance, insulin resistance and type 2 diabetes.
• Breathing problems, such as sleep apnea, and asthma.
• Joint problems and musculoskeletal discomfort.
• Fatty liver disease, gallstones, and gastro-esophageal reflux (i.e., heartburn).

Obese children and adolescents have a greater risk of social and psychological problems, such as discrimination and poor self-esteem, which can continue into adulthood.

Obese children are more likely to become obese adults. Adult obesity is associated with a number of serious health conditions including heart disease, diabetes, and some cancers.

http://www.cdc.gov/obesity/childhood/basics.html