Obesity-related knowledge, practices, and BMI-for-age status among adolescent senior secondary school students in Bwari Area Council, Abuja, Nigeria: a cross-sectional study.

Growing up is a time of rapid change, where the body transforms, habits form, and the line between childhood and adulthood begins to blur. For teenagers, this period is especially critical for nutrition because their bodies are still building themselves, making it difficult to judge health using the same rules applied to adults. A common way to measure weight relative to height is a number called body mass index, but for young people, this number must be adjusted for their age and sex to be meaningful. In many parts of the world, including Nigeria, the challenge is not just one type of problem; some teenagers struggle with being too thin, while others face the risks of carrying too much weight. Understanding how these young people think about food and health, and whether their daily actions match what they know, offers a window into the future of public health in rapidly changing communities.

In the Bwari Area Council of Abuja, Nigeria, a team of researchers set out to understand this complex picture among high school students. They focused on a specific group of adolescents, aged 13 to 19, attending senior secondary schools in the area. The goal was to look at three things simultaneously: what the students knew about obesity, what they actually did in their daily lives regarding diet and exercise, and their actual physical health status as measured by their weight and height. The researchers gathered data from over 400 students, carefully measuring their height and weight and asking them to answer questions about their habits and their understanding of health risks. They excluded any records that did not fit the strict age guidelines or contained impossible measurements, ensuring the final group represented a realistic cross-section of the local student population.

The results revealed a landscape of mixed understanding and behavior. When asked about the health risks of obesity, such as links to diabetes or high blood pressure, most students showed a moderate level of knowledge. About half of the group understood the basics well enough to be considered "moderate," while roughly a quarter had poor knowledge and another quarter had good knowledge. However, knowing the facts did not translate into healthy actions. The study found that the vast majority of students, nearly three-quarters, engaged in poor practices related to obesity. This included habits like frequently adding extra sugar to drinks, eating fried foods, or spending long hours sitting in front of screens. Only a tiny fraction of the students, just 2 percent, were classified as having good practices, such as eating regular meals, consuming fruits and vegetables daily, and avoiding sugary snacks.

Perhaps the most striking finding was that knowing what is healthy did not seem to influence what students actually did. The researchers looked closely to see if students with better knowledge were also the ones with better habits, but they found no statistical link between the two. A student could know that obesity is dangerous and still regularly consume sugary drinks or skip physical activity. This suggests that for these teenagers, the gap between knowing and doing is wide, likely because their choices are shaped by factors beyond just their own understanding, such as what food is available at home or school, peer pressure, or the cost of healthy options.

When the researchers measured the students' bodies, they found a double burden of nutrition issues coexisting in the same classroom. While the majority of students, nearly 80 percent, had a healthy weight for their age, the sample also included those who were underweight and those who were overweight or obese. Specifically, about 12 percent of the students were classified as thin, while roughly 9 percent fell into the overweight or obese categories. This mix confirms that in this community, the challenge is not just one-sided; schools must address both the risk of being too thin and the risk of carrying too much weight at the same time. The study also noted that male students were more likely to be underweight compared to their female peers, while the students' reported habits were linked to a higher likelihood of obesity, though the overall model did not show a strong connection between all the factors tested.

The researchers concluded that simply teaching teenagers about the dangers of obesity is not enough to change their behavior. Because knowledge and practice were not connected in this group, and because both undernutrition and overnutrition exist side by side, health programs in these schools need a broader approach. Instead of just handing out information, interventions should focus on creating environments where healthy choices are easier to make. This could mean improving the food available in school cafeterias, creating safe spaces for physical activity, and involving parents and teachers to support better habits. The study highlights that to truly help adolescents, schools must look beyond the classroom and address the daily realities that shape what these young people eat and how they move.