Nutritional Treatment of Overweight Adolescents With Cardiovascular Risk Factors (PowerUp)

Not Applicable

Terminated

• Conditions: Insulin Resistance; Childhood Obesity; Dyslipidemia; Hypertension
• Interventions: Other: Diet

• Registration Number: NCT00477477
• Lead Sponsor: Boston Children's Hospital

Brief Summary

This study is designed to evaluate the efficacy of two diets, a low glycemic load diet and a low saturated fat diet, in the treatment of adolescents with some heart disease risk factors associated with being overweight, such as high blood pressure, pre-diabetes, and cholesterol problems. The objective of the study is to determine which diet improves these risk factors more. The design of the study is a modified feeding study, which requests that the participants eat all and only the food provided by the study for 8 weeks, most days per week. Dietary counseling by phone will continue between 2 and 6 months of the study and the effects of this maintenance period will be assessed at 6 months time.

Detailed Description

The prevalence of obesity and overweight among children is high, and increasing. Metabolic syndrome, a recently recognized consequence of obesity, is known to confer an elevated risk for cardiovascular (CV) disease and diabetes type 2 in adults. The primary treatment for metabolic syndrome is lifestyle modification, including dietary changes. However, little is known about how dietary composition, as distinct from decreased caloric intake and weight loss, alters metabolic syndrome abnormalities in children. Moreover, the optimal pediatric nutritional strategy for prevention and treatment of metabolic syndrome is unknown. The overall goal of this research protocol is to evaluate two nutritional approaches to pediatric metabolic syndrome in post-pubertal overweight adolescents, a low saturated fat diet and a low glycemic load (GL) diet. The design of the protocol is a short-term, modified feeding study that evaluates the efficacy of these two nutritional approaches with equal weight loss goals. Outcome measures will include the percent changes from baseline to the end of the intervention period (8 weeks) in metabolic abnormalities, inflammatory cytokines and adipokines, and non-invasive tests of vascular function. Metabolomic profiles are measured at baseline and 8 weeks in a subset of the participants.

To facilitate compliance and adherence, participants chose from a menu of food choices and food will be delivered to participants homes to supply most of the meals and snacks participants consume. Participants will receive weekly personal nutritional counseling to enhance compliance with frequent phone follow-up. Subsequent to the feeding portion of the intervention, participants are counselled by phone at least on a monthly basis and the effects of this maintenance phase is measured at 6 months.

Study Timeline

• Study Start: 2007-05
• Study First Submitted: 2007-05-22
• Study First Submitted QC: 2007-05-22
• Study First Posted: 2007-05-23
• Primary Completion: 2012-05
• Study Completion: 2012-09
• Status Verified: 2014-10
• Last Update Submitted: 2014-10-24
• Last Update Posted: 2014-10-27

Recruitment & Eligibility

• Status: TERMINATED
• Sex: All
• Target Recruitment: 27

Inclusion Criteria

• Ages 8 to 17 years old
• Overweight, defined as BMI ≥ 85th%tile for age and gender
• At least two CV risk factor typical of the metabolic syndrome including insulin resistance, high or borderline blood pressure, low HDL, high TG
• Insulin > 10 u/L
• Able to attend study visits once a week at participant's home, and eat meals provided by the Children's Hospital CTSA Boston MA as supplied for most meals and snacks
• Non-smoker
• Able to understand/speak English
• Informed consent to participate from a parent or legal guardian. Adolescents must also provide written assent to participate in the study.

Exclusion Criteria

• Pre-existing physician diagnosis of a major medical illness or history of a major medical illness including but not limited to heart, kidney or liver disease, cancer, endocrinopathy including thyroid disorder, genetic syndrome or psychiatric illness, also including vasculitides such as Kawasaki disease or rheumatologic disorder; diabetes type I or II, evidence of severe fatty liver, hypertension requiring pharmacologic treatment, history of or current diagnosis of an major eating disorder
• Current or anticipated pregnancy
• Weight more than 275 lbs (125 kg)
• Abnormalities on initial screening assessment requiring pharmacotherapy urgent treatment, such as familial hyperlipidemia, end organ effects of hypertension, or metabolic abnormalities such as diabetes
• Taking any prescription medication or non-prescription substance that affects cholesterol levels, blood pressure, or insulin sensitivity (including but not limited to oral glucocorticoids, oral contraceptives, neuropsychiatric agents, anti-epileptics, HMG-CoA reductase inhibitors, bile acid binding cholesterol transport inhibitors among others) and the use of alcohol or illicit substances.
• Anticipated difficulty with participatory requirements of the study including food allergies, significantly restricted food preferences, or other difficulties as assessed by research staff.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
1	Diet	Low glycemic load diet
2	Diet	Low fat diet

Primary Outcome Measures

Name	Time	Method
Insulin resistance	8 weeks, 6 months

Secondary Outcome Measures

Name	Time	Method
Metabolomic profile	baseline, 8 weeks	The metabolomic profile of a subset of the participants will be measured at baseline and 8 weeks.
Inflammation	8 weeks, 6 months
coagulopathy	8 weeks, 6 months
vascular function	8 weeks, 6 months
blood pressure	8 weeks, 6 months
liver function testing	8 weeks, 6 months
dyslipidemia	8 weeks, 6 months

Trial Locations

Locations (1)

Children's Hospital Boston; 🇺🇸 Boston, Massachusetts, United States