Children’s health literacy is a crucial pillar of health. This study is aimed to examine the association between health literacy and weight status among Greek schoolchildren aged 10 to 12 years old. A population-based, cross-sectional observational study enrolling 1,728 students (795 boys), aged 10 to 12 years old, was conducted during school years 2014–2016. A health literacy index (range 0-100) was created through an item response theory hybrid model, by combining a variety of beliefs and perceptions of children about health. The mean health literacy score was 70.4 (±18.7). The majority of children (63.8%) had a “high” level (i.e., >67/100) of health literacy, 30.5% had a “medium” level (i.e., 34–66/100) of health literacy, while a small proportion of children (5.7%) had a “low” level (i.e., <33/100). Girls exhibited a higher level of health literacy than boys (71.7 ± 18.3 vs. 68.8 ± 19.1, p < .01). Regarding body weight status, 21.7% of children was overweight and 5.0% was obese. Linear regression models showed that the health literacy score was inversely associated with children’s body mass index (regression coefficient [95% CI]: −0.010 [−0.018, −0.001]), after adjusting for dietary habits, physical activity levels, and other potential confounders. Health literacy seems to be a dominant characteristic of children’s weight status; therefore, school planning, as well as public health policy actions should emphasize on the ability of children’s capacity to obtain, process, and understand basic health information.

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Background: Childhood obesity is among the leading public health challenges, worldwide. Aim: To examine the association between children’s adherence to the Mediterranean diet (MD) and weight status taking into account family structure and related behaviors. Methods: 1728 primary-school Greek students (46% males), from Athens metropolitan area, island of Crete, and the Peloponnese region, were enroled during school years 2014–2016. Children and their parents completed questionnaires which, among others, recorded family structure (i.e., married/cohabited, divorced, single parent, and widowed), dietary and lifestyle habits. Adherence to the MD was assessed through the KIDMED score (range - 4 to 12). Children’s body mass index was calculated and classified as normal, overweight/obese, according to the International Obesity Task Force classification. The working sample was 1142 children (44% males) with a recorded family structure. Results: The prevalence of overweight was 21.7% and obesity was 5.0%; overweight/obesity prevalence was higher among males than females (32.4% vs. 23.3%; p < 0.001). Overweight/obese children had a lower KIDMED score compared to normal weight (median (range): 4 (–2, 11) vs. 5 (–1, 10), p = 0.05). An inverse association between KIDMED score and children’s weight status (odds ratio (OR) (95% confidence interval (CI)): 0.95 (0.89–0.99)) was observed. Interaction between family structure and KIDMED was observed ( p < 0.001); stratified analysis revealed that in children from nuclear families the KIDMED score was inversely associated with the likelihood of overweight/obesity (OR (95% CI): 0.95 (0.88–1.00)), whereas in children from single-parent families it was not (OR (95% CI): 0.94 (0.79–1.12)). Conclusion: Adherence to the MD plays a protective role against childhood overweight/obesity, particularly among children living in nuclear families.

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