Evidence supporting the use of: Flaxseed
For the health condition: Triglycerides (high)

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Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Flaxseed is scientifically studied for its potential to lower high triglyceride levels. Flaxseed is rich in alpha-linolenic acid (ALA), an omega-3 fatty acid, and also provides lignans and dietary fiber. Several randomized controlled trials and meta-analyses have investigated its effects on blood lipid profiles, including triglycerides. Some studies have shown that flaxseed supplementation (either as ground seed or oil) can modestly reduce triglyceride levels, especially in people with elevated baseline levels or metabolic syndrome. The mechanism is likely due to the high ALA content, which can be metabolized into EPA and DHA, known for their lipid-lowering effects, though ALA conversion rates in humans are relatively low.

However, evidence is mixed. While some trials demonstrate significant reductions in triglycerides, others find minimal or no effect. The response may vary based on the dose, duration, and form of flaxseed used, as well as individual metabolic differences. A 2015 meta-analysis in the journal Nutrients suggested a modest triglyceride-lowering effect, but not as strong as that seen with marine omega-3s. Flaxseed is generally safe and well-tolerated, making it a reasonable adjunct for those seeking dietary approaches to manage lipid levels.

In summary, the use of flaxseed to support or treat high triglycerides is backed by moderate scientific evidence, but effects are generally modest and not universal. It is best seen as part of an overall heart-healthy diet rather than a standalone treatment.

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