I believe if a person is overweight and has a high A1c, losing weight could bring it down, but what they're eating would have a lot to do with it, too. Since your A1c is already in the normal range, I don't think yours will come down a lot with weight loss.
Your A1c reflects your blood sugar levels for the previous 3 months, so would not really be effected by what you ate the day before, so just eat normally, unless the doctor is also testing Fasting Blood Sugar, in which case you should fast for 10-12 hours before the test.
Hope this helps.
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