My A1c has edged up to 6.5 a few times, prompting me to get serious about heading off a slide into full blown diabetes..ive gone on a keto diet, and my A1c today was 5.1. I'm very pleased, but through my continuous glucose monitor, I know that whenever I have even a .modest amount of carbs, I have a very quick spike up to like 230, and once it went to 330!...even though it quickly drops down, this is not normal, and I've got to believe there's damage being down even with these temporary spikes, and even though my average is down to pretty good levels. Is this a sign of maybe something else going on?