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The purpose of this paper is to determine the prevalence of general and abdominal obesity among adolescents attending independent schools in Qatar.

A school-based cross-sectional study was conducted in November-December 2013 in 23 secondary schools. A total of 1,161 students aged 14 to 19 year olds were randomly selected using a multistage stratified cluster random sampling technique. Body weight, height and waist circumference (WC) were measured using standard protocol. The International Obesity Task Force (IOTF) age- and sex-specific body mass index (BMI) reference were used to define overweight and obesity. Abdominal obesity (AO) was defined by waist to height ratio (WHtR ≥ 0.5) and by sex- and age-specific WC cut-off values.

The prevalence of overweight and obesity among the study population was 20.6 and 20.7%, respectively. The highest rate of overweight and obesity was observed among boys, and the youngest age group. The rate of obesity defined by either WC/or WHtR was higher than that assessed by BMI. The prevalence of AO assessed by WC and WHtR was 48.8 and 46.9%, respectively. The rate of AO was significantly higher (p < 0.05) among boys compared to girls for both assessment criteria. The proportion of adolescents with AO (WHtR ≥ 0.5) according to BMI was 17.3%, 80.8% and 97.1% for adolescents with normal, overweight and obesity had AO, respectively. Being male was significantly associated with higher odds of having both general obesity and AO.

The study revealed a high prevalence of general and abdominal obesity in adolescents in Qatar. Waist measures appear to be an important indicator in identifying adolescents at risk and should be included as screening tools for cardiometabolic risk.

Prevalence of vitamin D insufficiency among young Qatari women is ∼85%. The purpose of the study was to develop a food frequency questionnaire (FFQ) and to assess the degree of agreement between food vitamin D intakes derived from FFQ and 24-h food recall (24HFR) in young Qatari women.

A vitamin D-centric, 40-item FFQ was developed based on foods consumed in Qatar. In total, 36 Qatari women provided food intakes using FFQ and 24HFR. Vitamin D contents of foods reported in FFQ and 24HFR were computed. Spearman rank correlation was used to evaluate the relation between vitamin D intakes of FFQ and 24HFR. Bland–Altman (BA) plot and quartile comparisons were performed to determine the degree of agreement between food intakes of FFQ and 24HFR.

Median intakes of vitamin D from FFQ were significantly higher compared to the vitamin D content from 24HFR (213 IU vs 126 IU; p < 0.008). Vitamin D intakes were lower with 24HFR when compared with the intakes of FFQ. There was no significant relationship between food vitamin D intake from FFQ and 24HFR (Spearman rho = 0.16; p < 0.35). In cross classification, ∼64% were assigned to the same or adjacent quartiles. As per BA plot, more than 95% food intakes were within the limits of agreement (LOA) (BA index, 2.8%).

There was a moderate agreement between vitamin D intakes and FFQ and 24HFR. 24HFR should be used with caution in assessing the habitual food vitamin D intake because of limited sources of the vitamer in Qatari cuisine. The FFQ is suitable for estimating the food vitamin D intake in young Qatari women.

This study aims to assess the students’ stage of change (SOC) for fruits and vegetables (FV) consumption using the 5-a-day and 9-a-day patterns; to validate a tool to measure SOC for consuming 5-a-day and 9-a-day of FV; and to investigate the relationship between SOC for FV consumption and body weight among Jordanian college students.

A cross-sectional study was conducted and included a convenient sample of 788 college students (47.7 per cent men and 52.2 per cent women) who completed validated questionnaires which included socio-demographic data, readiness to consume 5-a-day and 9-a-day servings of FV daily and FV consumption behaviors. Students’ heights and weights were measured. SOC for participants was examined using reparation, contemplation, pre-contemplation, action and maintenance stages.

A majority (69.9 per cent) of college students were in the pre-contemplation stage with regard to 9-a-day behavior. Females tended to be classified in the action stage more than males (P < 0.001). After controlling for age, gender and energy consumption, a significant (P < 0.05) inverse relationship was found between maintenance or action SOC for consuming 9-a-day behavior and body mass index (BMI). A large proportion of college students were in a pre-action stage for either consuming 5-a-day or 9-a-day of FV. Those students who followed the 9-a-day recommendations had significantly (P < 0.05) lower BMI values that those students in the pre-action stages.

The current study is genuine and original, and valuable in designing new strategies in lowering obesity and its comorbidities.

The purpose of this research is to develop a dynamic conceptual framework depicting factors related to the adoption of a healthy diet, which will underpin the development of an agent-based model (ABM) to uncover the dynamic interplay between these factors.

The conceptual framework was developed in three steps using available empirical data from a semi-structured in-depth interview qualitative study, comprehensive systematic literature searches, existing theories and models and expert opinions from across the world.

The conceptual framework explicitly presents intention as the key determinant of the tendency to adopt a healthy diet. Intention is determined by demographic, psychological and behavioural factors and individual dietary mindset factors and dynamically affected by social environment and the person's past behaviour. The relationship between intention and behaviour is dynamically moderated by perceived control factors (price and accessibility of healthy food and time).

The conceptual framework developed in this study is well supported by evidence and experts' opinions. This conceptual framework will be used to design the ABM of this study, and it can be used in future investigations on the tendency to adopt healthy diet and food choices.

The purpose of this study is to evaluate the associations between adolescents’ perceptions of their parents’ and peers’ opinions about body weight and their actual weight status.

A total of 795 Jordanian adolescents, 15-18 years of age, were recruited in this study. Adolescents completed a questionnaire to evaluate their perceptions: about how their parents’ and peers’ viewed their weight, regarding any criticism of their parents and peers about their weight and if their parents compared their weight against their siblings.

The study found that the majority of non-overweight adolescents thought their parents and peers considered them to have a normal weight (94.9 and 94.6 per cent for boys, 76.6 and 85.5 per cent for girls, respectively). For obese girls, 83.4 per cent thought their parents and 91.7 per cent thought their peers perceived them as overweight. The risk of being obese was significantly related to the amount of parental criticism perceived by adolescent girls with OR = 3.9 (95 per cent CI: 1.6-9.4; P = 0.01), while perception of peer criticism showed an increased trend of risk for obesity in boys. Adolescents’ perceptions regarding parental comparisons between their body weights against their siblings’ body weight was found to increase the risk for obesity significantly among girls.

The current study highlights that most of the obese adolescents perceived that their parents and peers underestimated their actual weight status. While obese boys were more likely to report being criticized about their body shape by their peers, obese girls indicated that they received more criticism about their weight from their parents.

The study was conducted to investigate the impact of competitive entrance exams on some lifestyle factors that may lead to body weight gain. The paper aims to discuss these issues.

A cross-sectional study was conducted on high school students (n=660), aged 16-20 years, to assess changes in body weight and fat percentage, dietary habits and physical activity practicing before and after the examination.

During the examination period, both males and females experienced weight gain, but the mean change of body weight for males was higher compared to the mean change of body weight observed in females (3.6 vs 0.6 kg). Body fat percentage increased in males and females in approximately 2 and 0.3 percent, respectively. In addition, males were found to skip breakfast (p=0.003) during the examination period as compared to females (p=1.00). Both males and females reported an increased consumption of milk (p=0.007 and 0.001), junk food (p=0.0001 and 0.001), caffeinated beverages (p<0.001) and carbonated drinks (p=0.001). A significant proportion from each gender reported that they quit recreational physical activity during the examination period (p=0.0001).

Several studies were conducted to investigate the impact of academic exams on stress among this vulnerable group; however, the relationship of body weight and obesity is still lacking in this population. Therefore, this study aims to investigate impact of competitive entrance exams on some lifestyle behaviours that may lead to body weight gain.