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Limited screen time is associated with the strongest improvement in physical fitness among children, followed by healthy eating, regular physical activity, and sufficient sleep.

In a nationwide cross-sectional study of 60,177 children in China, a higher Health Lifestyle Score (HLS) was significantly associated with better general physical fitness. Among individual lifestyle factors, limited screen time showed the strongest positive correlation (β=1.34; 95% CI, 1.24 to 1.45), followed by healthy eating (β=0.49; 95% CI, 0.39 to 0.59), regular physical activity (β=0.40; 95% CI, 0.34 to 0.46), and sufficient sleep (β=0.12; 95% CI, 0.04 to 0.20).

Last updated: Jul 25, 2026•0 RCTs•📖 Read as article →

Evidence Score

Evidence Score34/100
Human RCT☆☆☆☆☆
Meta-analysis☆☆☆☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

Study Evidence

Study 1. Association of healthy lifestyle and physical fitness in children: a nationwide population-based cross-sectional study.

observational

Fan M, Liu Y, Shen J, Yuan C, Yin X, Hou M · Frontiers in public health (2026)

Participants: N/A
Duration: 2015-2016 (cross-sectional, no follow-up)
Intervention: Assessment of four lifestyle factors: healthy eating, sufficient sleep, regular physical activity, and limited screen time, combined into a Health Lifestyle Score (HLS).
Outcome: General physical fitness measured by a Physical Fitness Index and individual adaptability.
Effect Size: β=1.34 (95% CI, 1.24 to 1.45) for limited screen time; β=0.49 (0.39-0.59) for healthy eating; β=0.40 (0.34-0.46) for physical activity; β=0.12 (0.04-0.20) for sufficient sleep.
Population: 60,177 children across 27 provinces in China, aged not specified but likely school-age, from 2015 to 2016.

Result:

PubMed: 42487781DOI: 10.3389/fpubh.2026.1885065

Mechanism Graph

Limited screen time reduces sedentary behavior and increases opportunities for physical activity.
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Healthy eating provides essential nutrients for muscle and bone development.
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Regular physical activity directly improves cardiovascular and muscular fitness.
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Sufficient sleep supports recovery and hormonal regulation for physical performance.
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Result: Combined healthy lifestyle factors lead to better physical fitness in children.

Limitations

  • ⚠Cross-sectional design prevents establishing causality between lifestyle factors and physical fitness.
  • ⚠Reliance on self-reported or parent-reported lifestyle data may introduce recall bias.
  • ⚠Study population limited to Chinese children, limiting generalizability to other regions or ethnicities.

Frequently Asked Questions

Which lifestyle factor had the strongest association with physical fitness in children?▼

Limited screen time showed the strongest association (β=1.34), followed by healthy eating, regular physical activity, and sufficient sleep.

How many children were included in this study?▼

The study included 60,177 children from 27 provinces across China.

Does sufficient sleep alone improve physical fitness in children?▼

Yes, sufficient sleep was positively correlated with physical fitness, but the effect size was smaller (β=0.12) compared to other lifestyle factors like limited screen time.

What was the study design and its main limitation?▼

This was a cross-sectional study, which means it can show associations but cannot prove that lifestyle factors cause improvements in physical fitness.

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References

  1. 1.Fan M, Liu Y, Shen J, Yuan C, Yin X, Hou M. "Association of healthy lifestyle and physical fitness in children: a nationwide population-based cross-sectional study.." Frontiers in public health, 2026. PMID: 42487781 DOI: 10.3389/fpubh.2026.1885065
Disclaimer: This content is for educational purposes only and is not medical advice. Evidence scores reflect the quality and quantity of available research, not clinical recommendations. Always consult a healthcare professional before starting any supplement or intervention.