Do all teens with a similar overall quality of life look the same? Researchers writing in Frontiers in Public Health (Child Health) suspected not. They asked whether adolescents fall into different groups based on their quality of life (QoL), meaning how they rate their physical and psychological wellbeing. They also asked whether sleep, physical activity, screen time and food habits are linked to which group a teen lands in.
The study surveyed 7,244 adolescents in China (49.3% boys) using the Quality of Life Scale for Children and Adolescents. The abstract does not give their ages. Teens' lifestyle habits were then compared across the groups.
Teen wellbeing split into five groups, not two
Using a statistical method that sorts people into hidden groups with similar answers, the team found five profiles: Low QoL, Health-advantaged, Moderate QoL, Low Physical and Psychological Health, and High QoL. The last two show that a teen can struggle in body and mind together, or do well across the board. The authors say this variety has been underexplored, and they suggest support should be tailored to the profile rather than one-size-fits-all.
More sleep, exercise and whole foods: a mixed picture
All comparisons were against the Moderate QoL group. Results are given as odds ratios (OR): below 1 means a teen is less likely to be in that group, above 1 means more likely.
- Sleep: Longer sleep went with lower odds of being in the Low QoL group (OR = 0.83) and the Health-advantaged group (OR = 0.74). It went with higher odds of the High QoL group (OR = 1.27), but also of the Low Physical and Psychological Health group (OR = 1.26).
- Physical activity: More activity went with higher odds of High QoL (OR = 1.62), but also of Low Physical and Psychological Health (OR = 1.41).
- Minimally processed foods (foods close to their natural state): Higher intake went with lower odds of Low QoL (OR = 0.70) and higher odds of High QoL (OR = 1.35), yet also higher odds of Low Physical and Psychological Health (OR = 1.78).
So the same habits were linked to both the best-off and one of the worst-off groups. The abstract does not explain why. It also does not report whether the Low Physical and Psychological Health group was defined in ways that might explain this, so we should not read it as sleep or exercise causing harm.
Screens and ultra-processed foods: some surprising results
Screen time was linked to lower odds of the Health-advantaged group and higher odds of the Low Physical and Psychological Health group. Ultra-processed foods (heavily factory-made foods) were linked to higher odds of the Low Physical and Psychological Health group (OR = 1.45). They were also linked to lower odds of the Low QoL group (OR = 0.25), the Health-advantaged group (OR = 0.54) and the High QoL group (OR = 0.56). That means ultra-processed food was not simply tied to worse wellbeing across the board, and the abstract offers no explanation.
How far these findings go
This study reports associations only. It cannot show that any habit changes a teen's wellbeing, and the abstract does not say whether teens were followed over time. All participants were Chinese adolescents, and the study did not cover Singapore, so we cannot say the same five groups or patterns apply here.
The clearest message is a cautious one. Teen wellbeing is not a single score, and lifestyle habits do not line up with it in a simple good-or-bad way. The authors call for support tailored to different profiles, and more research is needed before specific advice on sleep, activity, screens or food can be drawn from this work.