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There is no single food that will suddenly ruin your eyesight.
However, regularly eating large amounts of refined sugar, high-sodium foods, unhealthy fats, high-glycemic carbohydrates, and ultra-processed foods may contribute to diabetes, high blood pressure, and cardiovascular problems that can affect eye health over time.
A better long-term approach is to build most meals around vegetables, fruits, whole grains, beans, fish, eggs, nuts, seeds, and other nutrient-rich foods.
Combined with regular eye exams, good blood sugar and blood pressure control, UV protection, and avoiding smoking, a balanced diet can help support healthy vision for years to come.