Family Intervention for Obese Children Using Portion Control Strategy for Weight Control

This study is a randomized controlled trial designed to assess the efficacy of a portion control tool to help improve body mass index in obese children over a 6 months period. This study will also assess whether this weight control strategy results in improvement of blood pressure, waist circumference, and biomarkers of obesity including plasma visfatin, adiponectin, fasting lipid profile and apolipoprotein B, liver function tests and fasting insulin and glucose. Both the intervention and the control group will receive a one hour session of standard dietary counseling from a registered dietician at baseline regarding healthy eating habits, appropriate portion sizes and the Canada Food Guide. The duration of this study will be 6 months. Baseline measurements will be taken at the initial visit and again at 3 months and 6 months. Each participants' height and weight will be measured, and BMI will be calculated. Waist circumference and blood pressure will also be measured. A blood sample will be drawn at baseline and 6 months for a fasting lipid profile, fasting insulin, and glucose levels. Measurement of plasma visfatin and adiponectin levels using ELISA will be carried out.

Inclusion criteria

• age 8 years old to 16 years old
• BMI greater than or equal to the 85th percentile for age and gender

Exclusion criteria

• patients currently taking a weight loss medication
• gastrointestinal disorder
• psychiatric illness under the care of a psychiatrist
• Cushing's syndrome
• hypothalamic or genetic etiology of obesity
• uncontrolled or untreated thyroid disease
• current diagnosis of cancer
• history of an eating disorder such as bulimia or anorexia nervosa
• surgery in the past 3 months
• surgery planned in the ensuing 6 months
• any chronic illness that could affect weight status