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Dietary supplements are marketed to people worried about their eyes, and recommended by eye healthcare professionals for people who have signs of age-related macular degeneration (AMD). But how much do we actually know about which dietary interventions prevent or slow down the progression of AMD? And what do we know about the adverse effects of supplements? This article summarises the Cochrane reviews on nutritional supplementation in AMD.
There are three relevant reviews on The Cochrane Library.1–3 Overall the reviews include a total of 16 trials. Two reviews focus on the role of antioxidant supplementation in the prevention1 and progression2 of AMD and one review focuses on the role of omega 3 fatty acid (ω-3) supplementation.3 The reviews are slightly different in scope: the antioxidant reviews are restricted to dietary supplements (pills containing vitamin/mineral supplements alone or in combination); the ω-3 review also considers dietary sources, for example, fish consumption. All three reviews focus on intervention studies, specifically experimental studies where participants have been randomly allocated to dietary supplement or placebo/no intervention.
The Cochrane review on antioxidant vitamin and mineral supplements to prevent AMD includes four trials.1 The searches for trials were last done in January 2012. This review provides high quality evidence that people aged 40 years and above in the general population are unlikely to prevent the development of AMD by taking vitamin E or β-carotene supplements. …