Evidence supporting the use of: Polyunsaturated Fat
For the body system: Eyes

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Synopsis

Source of validity: Scientific
Rating (out of 5): 4

Polyunsaturated fats, particularly omega-3 fatty acids such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), are well-supported by scientific evidence in their role in supporting eye health. DHA is a major structural component of the retina, and its presence is critical for the normal development and function of retinal cells. Epidemiological studies and clinical trials have shown that higher dietary intake of omega-3 polyunsaturated fats is associated with a reduced risk of age-related macular degeneration (AMD), one of the leading causes of vision loss in older adults. For example, the Age-Related Eye Disease Study (AREDS) and other large-scale studies have found that individuals with higher intakes of omega-3s had a lower incidence and slower progression of AMD. Additionally, omega-3 supplementation has been shown to alleviate symptoms of dry eye disease, likely due to its anti-inflammatory properties.

While the evidence is strong for omega-3s, not all polyunsaturated fats (e.g., omega-6s) have the same effect, and some research suggests that an imbalance between omega-6 and omega-3 intake may be detrimental. Overall, the scientific consensus supports the benefit of omega-3 polyunsaturated fats for eye health, particularly in the context of maintaining retinal structure and function and reducing the risk of certain degenerative eye conditions.

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