Researchers at universities in Vietnam analysed data from 17,814 American teenagers aged 12–18 to understand what drives overweight and obesity during adolescence. They used information from the 2023 Youth Risk Behavior Surveillance System—a large US health survey—and applied advanced computer analysis to identify which factors most strongly predict whether a teen currently has overweight or obesity.
At the time of the survey, nearly one in three teens (31.8%) had overweight or obesity, a figure that underscores how widespread the issue is among this age group.
Six factors emerged as the strongest predictors of teen weight
When researchers looked at the full range of information collected—including demographic details, lifestyle habits, and psychological factors—they found six elements that stood out: sex, race/ethnicity, physical activity level, sleep duration, age, and how often a teen ate breakfast. Physical activity and breakfast frequency showed a protective effect: teens who did more moderate-to-vigorous exercise and ate breakfast more regularly had lower odds of overweight or obesity. In contrast, male teens and those from certain racial and ethnic groups showed higher odds, though the study does not explain why these differences exist.
Sleep duration matters more than previously thought
Among the factors analysed, sleep emerged as one of the six most influential predictors—a finding sometimes overlooked in discussions about teen weight. The study identified sleep length as a strong contributor to current weight status, though it did not specify whether shorter or longer sleep was linked to higher weight, or what the optimal range might be for teenagers.
These findings describe current weight, not future weight gain
An important limitation: this research is a snapshot. All measurements—weight, physical activity, sleep, breakfast habits, and demographics—were collected at the same time, so the study can only describe which teens *currently* have overweight or obesity, not predict who will develop it in the future. The authors emphasise that before these findings could be used to screen or prevent obesity in any population, including teenagers in Singapore or Vietnam, the results would need to be tested with new groups of teens studied over time.