Yaşa Bağlı Makula Dejenerasyonu ve Beslenme Arasındaki İlişki
Özet
Endüstriyel dünyada ileri yaş grubundaki merkezi görme kaybının temel nedenlerinden biri olan yaşa bağlı makula dejenerasyonu (YBMD), beslenme ve antioksidanlar arasındaki ilişki bağlamında kapsamlı bir şekilde incelenmektedir. Hastalığın patofizyolojisi metabolik, fonksiyonel, genetik ve çevresel faktörlerin karmaşık etkileşimlerine dayanmakta olup, ileri yaş ve sigara kullanımı en önemli risk faktörleri arasında yer alır. Atrofik (kuru) YBMD formu için henüz bir tedavi bulunmazken, eksüdatif (yaş) formunda intravitreal anti-VEGF enjeksiyonları ilerlemeyi yavaşlatabilmektedir. Bu doğrultuda, hastalıktan korunma ve ilerlemeyi geciktirmede diyet antioksidanlarının rolü kritik öneme sahiptir. Yapılan preklinik ve klinik çalışmalar; çinko, karotenoidler (lutein ve zeaksantin), A, C, E vitaminleri, omega-3 yağ asitleri ve resveratrol gibi maddelerin retinal pigment epiteli hücrelerini oksidatif stres, inflamasyon ve anjiyogenez hasarından koruduğunu göstermektedir. Özellikle AREDS ve AREDS2 gibi çok merkezli klinik çalışmalar, bu takviyelerin hastalık evrelerinin ilerleme riskini ve görme keskinliğindeki düşüşü anlamlı ölçüde azalttığını kanıtlamıştır. Ayrıca, antioksidanlar açısından doğal olarak zengin olan Akdeniz ve Doğu diyetlerini benimseyen popülasyonlarda YBMD prevalansının daha düşük olması, beslenme düzeninin koruyucu ve terapötik etkisini güçlü bir şekilde desteklemektedir.
Age-related macular degeneration (AMD), one of the leading causes of central vision loss in the elderly population of the industrialized world, is comprehensively examined in the context of the relationship between nutrition and antioxidants. The pathophysiology of the disease is based on complex interactions of metabolic, functional, genetic, and environmental factors, with advanced age and smoking being the most significant risk factors. While there is currently no treatment for the atrophic (dry) form of AMD, intravitreal anti-VEGF injections can slow the progression of the exudative (wet) form. Accordingly, the role of dietary antioxidants is of critical importance in preventing the disease and delaying its progression. Preclinical and clinical studies demonstrate that substances such as zinc, carotenoids (lutein and zeaxanthin), vitamins A, C, and E, omega-3 fatty acids, and resveratrol protect retinal pigment epithelial cells from damage caused by oxidative stress, inflammation, and angiogenesis. Particularly, multicenter clinical trials like AREDS and AREDS2 have proven that these supplements significantly reduce the risk of disease progression and the decline in visual acuity. Furthermore, the lower prevalence of AMD in populations adopting Mediterranean or Eastern diets, which are naturally rich in antioxidants, strongly supports the protective and therapeutic effects of nutritional patterns.
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