Big effect
Flaxseed supplementation linked to a large drop in body weight in a meta-analysis of diabetics — but the evidence behind that number is surprisingly thin.
This finding suggests flaxseed may help with weight loss in type 2 diabetes, but with only four studies backing it and half of them showing no effect, the picture is far from settled.
A meta-analysis of 1,136 people with type 2 diabetes found that flaxseed supplementation led to a statistically significant and large reduction in body weight, along with decreases in waist circumference and triglycerides. However, the same analysis found no effect on body mass index, blood pressure, or cholesterol levels, and the overall quality of the evidence was rated very low due to conflicting results across the few available studies.
Where this fits in the evidence
Pillser has synthesized 4 studies on flaxseed for Reduced Body Weight — overall evidence strength: Low.
Across 4 studies, 2 reported beneficial effects of flaxseed supplementation on reduced body weight, with 2 showing neutral results. The largest and highest-quality study—a meta-analysis of 1,136 participants with type 2 diabetes—found a large, statistically significant benefit (SMD: 0.81; p = 0.028). The predominant effect size is mixed (small to large), and effects were typically observed at 8 weeks (median study duration: 56 days). Most evidence comes from clinical populations, particularly people with type 2 diabetes or coronary artery disease.
The study
- Meta-Analysis
- n = 1,136
- 2025-05
- Diabetes & metabolic syndrome
This is a plain-language summary of a research finding, not medical advice. Pillser surfaces research signals to help you decide what's worth investigating — always consult a qualified professional before changing what you take.