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Background:
Obesity affects 1 in 5 children in the United States. Childhood obesity often persists into adolescence and adulthood. It can also raise the risk of sleep apnea, fatty liver disease, and fluid buildup in the brain and lead to early-onset puberty. This natural history study will explore how factors such as genes, hormones, diet, and chemical exposures affect puberty in children with obesity.
Objective:
To learn which factors predict the early start of puberty in children with obesity vs those of normal weight.
Eligibility:
Children aged 5 to 7 years with obesity or of normal weight.
Design:
Participants will have clinic visits every 6 months until they reach age 12.
Each clinic visit will include these tests and procedures:
A physical exam.
Collection of blood, urine, and saliva samples. Some samples will be used for genetic tests.
Questions about medical history and medications and supplements.
A questionnaire about their physical activity over the previous week.
A silicone wrist band. Participants will wear a soft wristband for a week prior to each visit. It will tell researchers what chemicals the children were exposed to during that time.
Breast ultrasound, for girls. A gel will be applied, and a wand will be pressed against the skin. The wand uses sound waves to see the tissue inside the breast.
DXA whole body scan. Once a year, participants will have a DXA (dual energy X-ray absorptiometry) scan. This scan measures the amount of bone, muscle, and fat in the body.
Optional food diary. Parents may record everything the participant eats for two 24-hour periods
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