The Claim
Serum IGF-1 levels in healthy Korean men aged 19–40 years are significantly higher in winter and spring compared to autumn, with mean concentrations of 237.4 ng/mL in winter versus 168.5 ng/mL in autumn, suggesting a seasonal association with ambient temperature that may influence growth hormone activity.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
In young Korean men, the level of a growth-related hormone in the blood tends to be higher during winter and spring than in autumn, and this might be linked to changes in the weather.
See the scientific wording
Serum IGF-1 levels in healthy Korean men aged 19–40 years are significantly higher in winter and spring compared to autumn, with mean concentrations of 237.4 ng/mL in winter versus 168.5 ng/mL in autumn, suggesting a seasonal association with ambient temperature that may influence growth hormone activity.
What the research says
1 studyThis study found that young Korean men have more IGF-1 (a growth-related hormone) in winter and spring than in autumn, which matches the claim. It suggests that seasons — maybe because of colder weather — affect this hormone.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.