Stacey Tweed

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The reinforcing effects of addictive drugs and palatable foods are regulated, at least in part, by a common biological mechanism. The reactivity or sensitivity of these brain reward regions have been found to correlate significantly with the risk for a variety of drug addictions. Sensitivity to Reward (STR) is conceptualised as a psycho-biological(More)
BACKGROUND Some recent studies have reported strong links between obesity and ADHD in adults; however, to date, little work has focussed on possible behavioural mechanisms that could account for this association. METHOD This study used structural equation modelling (SEM) in a sample of healthy adult women to test the predictions that ADHD symptoms predict(More)
This study was a controlled evaluation of a comprehensive school-based universal prevention program involving male and female students, parents, teachers, school administrators and local public health professionals. A total of 982 male and female Grades 6 and 7 middle school students (and 91 teachers/school administrators) completed self-report surveys at(More)
The effectiveness of a web-based prevention program designed for elementary school teachers was examined in 78 elementary school teachers and 89 local public health practitioners (who provide support to schools). Participants were assigned to either the intervention (n = 95) or comparison (n = 72) study groups. All participants completed self-report online(More)
OBJECTIVE The purpose of the current study was to evaluate the effectiveness of a life-skills promotion program designed to improve body image satisfaction and global self-esteem, while reducing negative eating attitudes and behaviors and feelings of perfectionism, all of which have been identified as predisposing factors to disordered eating. METHOD A(More)
In order to better understand how global climate change will affect greenhouse gas dynamics in wetland systems, an accurate quantification of global greenhouse gas emissions from these areas is essential. Despite a large proportion of wetlands occurring in tropical areas, data on greenhouse gas fluxes from these areas is limited. This study aimed to(More)
We examined the prevalence of dieting and negative eating attitudes among 2279 females (aged 10-14 years) in southern Ontario. Self-report questionnaires revealed that 29.3% of the girls were currently trying to lose weight and 10.5% had scores greater than the clinical threshold for disordered eating (Children's version of the Eating Attitudes Test [ChEAT](More)
BACKGROUND This study examined the influence of appearance and social acceptance esteem, awareness and internalization of media stereotypes, body size acceptance, and teasing on the weight loss and muscle-gaining behaviors of 10- to 14-year-old boys and girls. METHODS Male (n = 670) and female (n = 788) students were drawn from one of four public senior(More)
The evaluation of a school-based peer support group previously shown to improve body esteem and global self-esteem and reduce dieting in young adolescent girls was replicated in the present study. A total of 282 girls in grades 7 and 8, 196 of whom were in the control group, completed self-report questionnaires immediately before and after the life skills(More)
PURPOSE Children as young as 12 years of age are presenting for treatment of an eating disorder (ED), underscoring the need to understand the psychological and social make-up of this age group. Early adolescent females seeking treatment for an eating disorder were compared with healthy age-matched controls on psychosocial variables relevant to this stage of(More)