Cornbread is mostly carbs and probably contains some form of fat.
Because of the carbs, consuming cornbread will increase your blood glucose.
How much it increases your blood glucose depends on how much of it you eat, what you eat with it, how much your glucose metabolism has deteriorated, and if you use meds/insulin to control glucose levels.
The best way to determine how much your blood glucose will increase is to use your meter after you consume the cornbread.
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