Study
Cocoa Extracts Not Effective in Reducing Diabetes Risk for Seniors
A study found that taking cocoa extract supplements did not lower the risk of developing type 2 diabetes in older adults.
Summary
In plain language
A recent study looked at whether taking cocoa extract supplements could help prevent type 2 diabetes in older adults. Over 18,000 men and women participated, all of whom were free of diabetes at the start. They took cocoa extract supplements for about 3.5 years. The study found no significant difference in the number of new diabetes cases between those who took the supplements and those who did not. This suggests that cocoa extract might not be effective in reducing diabetes risk. Seniors interested in diabetes prevention should continue discussing other strategies with their healthcare providers.
Details
Use the full description to understand the study design, methods, and the limits of the findings.
This study was part of the Cocoa Supplement and Multivitamin Outcomes Study (COSMOS) and involved 18,381 older adults who were given either a cocoa extract supplement or a placebo. The participants were monitored for about 3.5 years to see if the supplements would prevent type 2 diabetes.
The study found no significant reduction in new diabetes cases among those taking cocoa supplements compared to the placebo group.
Researchers noted that the effect was consistent across different groups, regardless of sex, race, or lifestyle factors.
The study suggests that while cocoa has been considered beneficial for health, it may not help in diabetes prevention for older adults.
It's important for seniors to discuss diabetes prevention strategies, including diet and exercise, with their healthcare providers.
Full Study
Open the original publication for the complete methods, outcomes, and source material.
Cocoa Extracts Not Effective in Reducing Diabetes Risk for Seniors
Published October 2026
Opens at the publisher · external site · may require institutional access
Research Quality Score
Scored October 22, 2026 using rubric mq-1.8_2026-07-06.
Assessment
The study scored highly in study design and bias control due to its robust RCT methodology, including randomization and blinding. Statistical integrity was strong with comprehensive data analysis. Transparency was ensured through pre-registration and detailed reporting. However, conflicts of interest were present due to industry funding, and no replication was cited. The study was relevant to the target population of seniors, but journal quality could not be assessed.
Category Breakdown
| Category | Score | Rating |
|---|---|---|
| Study design | 10.0/10 | |
| Bias control | 10.0/10 | |
| Statistical methods | 10.0/10 | |
| Reporting completeness | 10.0/10 | |
| Conflicts & funding | 5.0/10 | |
| Replication | 0.0/10 | |
| Relevance to chosen population | 10.0/10 | |
| Journal Reliability | 5.0/10 |
Additional Notes
The COSMOS trial investigated the effect of cocoa extract supplementation on type 2 diabetes risk in older adults. Over a median follow-up of 3.5 years, cocoa extract did not significantly reduce diabetes incidence compared to placebo.
Assessed on the study's full text across 8 quality dimensions; conflict-of-interest disclosures were reviewed.
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