According to a prospective study published in JAMA Ophthalmology, people aged 55 years or older with type 2 diabetes who eat at least 2 weekly servings of oily fish may prevent or delay sight-threatening diabetic retinopathy (DR) in addition to reducing their risk of cardiovascular disease. The study involving patients with diabetes was conducted within the randomized clinical trial Prevencion con Dieta Mediterranea (PREDIMED), which tested Mediterranean diets supplemented with extra virgin olive oil or nuts versus a control diet for primary cardiovascular disease prevention.
Slomski A. Eating Oily Fish May Protect Against Diabetic Retinopathy. JAMA. 2016;316(16):1637. doi:10.1001/jama.2016.15436