Can diabetic patients eat mango in summer, or does its sweetness secretly spike blood sugar levels? Many people avoid mangoes because of this common fear, but the answer may surprise you. Despite its sweet taste, mango has a low glycemic index (GI) of 48, making its effect on blood sugar very different from what most assume. Read on to uncover the truth behind can diabetic patient eat mango and how the glycemic index changes the whole story.