Evidence Intelligence™
- ImpactScore™
- 67
- Slightly Positive
- EvidenceScore™
- Strong
- Score 79 · Based on 3 studies
- ConsistencyScore™
- 67
- generally_consistent
Supporting studies: Based on 3 studies
Unlock full evidence detailsResearch Summary
Analyzed using Evidence Intelligence™
Vitamin D does not lower diabetes risk in older adults
Last updated July 2, 2026
Key finding
There were 38 (5.0%), 31 (4.2%) and 36 (4.7%) type 2 diabetes events in the placebo, 1600 IU/day vitamin D 3 and 3200 IU/day vitamin D 3 arms, respectively (p-trend=0.73).
This study investigated the effects of vitamin D supplementation on type 2 diabetes risk in older adults, finding no significant reduction in diabetes events.
Quick read
Study at a glance
The essential study design details in one scan.
EvidenceScore™
Moderate
Study type
RCTs
Follow-up
Extended (5–20+ y)
Risk of bias
Some Concerns
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Plain-language summary
What this paper says
A plain-language read of the study's main message and where it applies.
Study focus
This study investigated the effects of vitamin D supplementation on type 2 diabetes risk in older adults, finding no significant reduction in diabetes events.
Clinical relevance
Understanding the role of vitamin D in diabetes prevention is crucial, especially for older adults who are at higher risk. These findings suggest that vitamin D supplementation alone may not be an effective strategy for reducing diabetes risk in this population, prompting a need for further research into alternative prevention methods.
Keep in mind
The study may have limited generalizability due to the specific population studied. The follow-up period of 24 months may not be sufficient to observe long-term effects. Effectiveness of vitamin D supplementation may vary based on individual health factors not accounted for.
Published in
Journal Reference
Publication details and source links for this paper.
Jyrki KV, Sari H, Niko K, et al. Vitamin D supplementation does not significantly reduce the risk of type 2 diabetes in older adults. Diabetologia. 2024;68(4):715-726. doi:10.1007/s00125-024-06336-9
Main Effects
No significant difference in type 2 diabetes events: 5.0% (placebo), 4.2% (1600 IU), 4.7% (3200 IU), p-trend=0.73.
No changes in plasma glucose levels during follow-up (p values ≥0.19).
No differences in BMI changes over the 24 months (p values ≥0.19).
Evidence network
How this study fits
Understand where this research contributes within the broader evidence network.
Evidence Context
This study contributes evidence to Vitamin D supplementation and BMI, Blood glucose, type 2 diabetes mellitus.
This study contributes evidence to
Primary intervention
Vitamin D supplementation
Primary outcomes
- BMI
- Blood glucose
- type 2 diabetes mellitus
Evidence topics
Primary intervention
Primary outcomes
Evidence relationships
Intervention and outcome relationships this study adds to the evidence network.
3
Evidence pairs
3
Relationships
2
Evidence topics
contributes_evidence
Editorial context
Why this study matters
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Evidence network role
This section describes how the study fits into the current evidence network. It does not determine whether an intervention works on its own.
Moderate contributionModerate confidenceNetwork score: 64
2
Related topics
3
Evidence pairs
204
Related studies
High relevance in at least one topic
Why it is useful
- Contributes to 3 evidence relationships
- Includes primary outcome data
- Linked to 2 direct semantic evidence topics
Topic contributions
Evidence topic
Contributes evidence
Evidence topic
Contributes evidence
Core evidence
Study findings
The primary outcomes reported in this study.
Evidence Intelligence™
- ImpactScore™
- 50
- Neutral
- EvidenceScore™
- Moderate
- Score 69 · Based on 2 studies
- ConsistencyScore™
- 100
- consistent
Supporting studies: Based on 2 studies
Unlock full evidence detailstype 2 diabetes mellitus
Vitamin D supplementation → type 2 diabetes mellitus
Vitamin D supplementation → type 2 diabetes mellitus
Evidence Intelligence™
- ImpactScore™
- 50
- Neutral
- EvidenceScore™
- Moderate
- Score 69 · Based on 2 studies
- ConsistencyScore™
- 100
- consistent
Supporting studies: Based on 2 studies
Unlock full evidence detailsUnlock full evidence analysis
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Evidence Suggest
- Vitamin D supplementation did not significantly reduce diabetes incidence in older adults.
- No significant changes in blood glucose levels were observed.
- BMI changes were also not significantly different among the groups.
Who this applies to
- Older adults at risk for type 2 diabetes.
- Individuals considering vitamin D supplementation for diabetes prevention.
Keep in Mind
- Results may not apply to younger populations or those with different health conditions.
- The study's findings do not support vitamin D as a standalone intervention for diabetes prevention.
- Further research is needed to explore other potential interventions for diabetes risk reduction.
Between the Lines
- The study may have limited generalizability due to the specific population studied.
- The follow-up period of 24 months may not be sufficient to observe long-term effects.
- Effectiveness of vitamin D supplementation may vary based on individual health factors not accounted for.
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Connected Evidence
Explore related studies, evidence collections, and research questions.
Relationships organized using the Dediabetes Evidence Intelligence™ framework.
This study contributes to evidence on Vitamin D supplementation and Fasting Glucose, Vitamin D supplementation and Body Mass Index.
Related evidence relationships
Explore in Evidence ArchiveThis study contributes to the evidence on the following intervention-outcome relationships.
Supplements
Detailed evidenceVitamin D supplementation → Fasting Glucose
Supplements
Evidence Intelligence™
- ImpactScore™
- 67
- Slightly Positive
- EvidenceScore™
- Strong
- Score 79 · Based on 3 studies
- ConsistencyScore™
- 67
- generally_consistent
Supporting studies: Based on 3 studies
View evidenceSupplements
Detailed evidenceVitamin D supplementation → Body Mass Index
Supplements
Evidence Intelligence™
- ImpactScore™
- 50
- Neutral
- EvidenceScore™
- Moderate
- Score 69 · Based on 2 studies
- ConsistencyScore™
- 100
- consistent
Supporting studies: Based on 2 studies
View evidenceIncluded in these evidence collections
Curated evidence collections and hubs this study is part of.
Fasting Glucose Evidence Hub
All studies measuring Fasting Glucose
3 studies
outcome_hubMeasures Fasting Glucose as a key outcome.
Vitamin D supplementation Evidence Hub
All studies on Vitamin D supplementation
3 studies
intervention_hubContributes to Vitamin D supplementation evidence base.
Body Mass Index Evidence Hub
All studies measuring Body Mass Index
2 studies
outcome_hubMeasures Body Mass Index as a key outcome.
Recent Diabetes Research
Latest published studies
recency_collection
Published within the last 2 years.
Explore more in the evidence archive
Jump to pre-filtered views in the evidence archive.
All studies on Vitamin D supplementation and Blood glucose
Intervention: Vitamin D supplementationOutcome: Blood glucose
3 results
All studies on Vitamin D supplementation and BMI
Intervention: Vitamin D supplementationOutcome: BMI
2 results
All studies on Vitamin D supplementation
Intervention: Vitamin D supplementation
3 results
All studies measuring Blood glucose
Outcome: Blood glucose
3 results
All studies measuring BMI
Outcome: BMI
2 results
Questions answered by this study
Generated from the study's connected evidence using Evidence Intelligence™.
Does Vitamin D supplementation improve blood glucose?
Strong Evidence
Vitamin D supplementation may improve Blood glucose.
ConsistencyScore™: Results are generally consistent across studies.
Ranked evidence signals
- 1
Blood glucose
EvidenceScore™ Strong | EvidenceScore™ 79.0 | weak positive | ConsistencyScore™ Generally Consistent | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
- Only one supporting study is available.
- Population details are unavailable.
Does Vitamin D supplementation affect bmi?
Moderate Evidence
Current evidence does not show a clear benefit of Vitamin D supplementation for BMI.
ConsistencyScore™: Results are consistent across studies.
Ranked evidence signals
- 1
BMI
EvidenceScore™ Moderate | EvidenceScore™ 69.0 | neutral | ConsistencyScore™ Consistent | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
- Only one supporting study is available.
- Population details are unavailable.
Does Vitamin D supplementation improve type 2 diabetes mellitus?
Moderate Evidence
Current evidence does not show a clear benefit of Vitamin D supplementation for type 2 diabetes mellitus.
ConsistencyScore™: Results are consistent across studies.
Ranked evidence signals
- 1
type 2 diabetes mellitus
EvidenceScore™ Moderate | EvidenceScore™ 69.0 | neutral | ConsistencyScore™ Consistent | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
- Only one supporting study is available.
- Population details are unavailable.
Next steps
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