The Claim
Vitamin D supplementation has no significant effect on insulin sensitivity (as measured by QUICKI) in overweight and obese children and adolescents.
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.
Giving vitamin D supplements to overweight and obese children and adolescents does not change their insulin sensitivity, based on current evidence from controlled trials.
See the scientific wording
Vitamin D supplementation does not significantly improve insulin sensitivity (QUICKI) in overweight and obese children and adolescents, based on two randomized controlled trials with 79 participants, despite theoretical biological plausibility.
When overweight children take vitamin D supplements, the vitamin gets stored in their fat tissue instead of circulating in the blood. This means not enough active vitamin D reaches the cells that need it to improve how they respond to insulin. Even though the active form of vitamin D can help cells take up sugar better, the low amount available in the blood prevents this from happening, so insulin sensitivity does not improve.
What the research says
1 studyEven though doctors thought vitamin D might help kids with extra weight use insulin better, this big review of studies found it didn’t actually make any difference in how well their bodies used insulin.
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.