I wore a monitor for two weeks. As someone who basically does not eat processed food, including sugar, and has 4-5 meals a day always including vegetables/fiber it was not obvious that what I ate had any reliable impact on the count. It would go up and down seemingly at random throughout the day and night. The highest and most reliable spikes came when I was lifting weights. Likewise cardio, especially high intensity cardio made it drop to its lowest levels. The most interesting outcome was that the late afternoon hanger I often felt was not associated with a dip (or change at all) in blood glucose as I expected it would be, so that remains a mystery.
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