Mediators of weight loss in a family-based intervention presented over the internet.
OBJECTIVE
To assess the process variables involved in a weight loss program for African-American adolescent girls. Several process variables have been identified as affecting success in in vivo weight loss programs for adults and children, including program adherence, self-efficacy, and social support. The current study sought to broaden the understanding of these process variables as they pertain to an intervention program that is presented using the Internet. It was hypothesized that variables such as program adherence, dietary self-efficacy, psychological factors, and family environment factors would mediate the effect of the experimental condition on weight loss.


METHODS
Participants were 57 adolescent African-American girls who joined the program with one obese parent; family pairs were randomized to either a behavioral or control condition in an Internet-based weight loss program. Outcome data (weight loss) are reported for the first 6 months of the intervention.


RESULTS
Results partially supported the hypotheses. For weight loss among adolescents, parent variables pertaining to life and family satisfaction were the strongest mediating variables. For parental weight loss, changes in dietary practices over the course of 6 months were the strongest mediators.


CONCLUSIONS
The identification of factors that enhance or impede weight loss for adolescents is an important step in improving weight loss programs for this group. The current findings suggest that family/parental variables exert a strong influence on weight loss efforts for adolescents and should be considered in developing future programs.
Pennington Biomedical Research Center, Louisiana State University, Baton Rouge, USA. marney.white@yale.edu
Marney A
MA
White
Pamela D
PD
Martin
Robert L
RL
Newton
Heather M
HM
Walden
Emily E
EE
York-Crowe
Stewart T
ST
Gordon
Donna H
DH
Ryan
Donald A
DA
Williamson
D015502:Absorptiometry, Photon; D000273:Adipose Tissue; D000293:Adolescent; D001521:Behavior Therapy; D044383:Black People; D001823:Body Composition; D015992:Body Mass Index; D002648:Child; D004032:Diet; D015930:Diet Records; D004777:Environment; D015444:Exercise; D005192:Family Health; D005247:Feeding Behavior; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D020407:Internet; D011939:Mental Recall; D009765:Obesity / Q000235:genetics / Q000523:psychology / Q000628:therapy*; D010349:Patient Compliance; D015431:Weight Loss; D001741:Black or African American