on my last blood work, my blood sugar was int he “Pre-Diabetes” level.
I am working to curtail this in my day to day life, but wondering what effect my on the bike nutrition has on this? Or how I should change my nutrition to facilitate improvement in this health metric
I’d suggest to start by gathering some date on how your blood sugar responds to a bike session. Without changing anything with your current routine, test your blood sugar prior to riding, shortly after riding then approximately an hour to hour and an half after riding. You can do this with a finger stick blood glucose meter or wearing a continuous glucose monitor (the CGM is significantly more expensive).
If you blood sugar spikes during the ride and stays elevated at the 1-1.5 hour check that’s a pretty sure sign your fueling strategy should be changed by reducing your carb intake.
If it doesn’t then you probably don’t need to change it for the time being, but would recommend periodically rechecking.
I say all this as a registered dietitian, diabetes educator and type 1 diabetic- but it’s not medical advice 
just a suggestion.
From my understanding, during exercise (and why it’s good for diabetics) your body’s insulin respond is basically shut down. Your muscles are taking up the glucose and there should not be any spike in blood sugar. A good friend I train with is type 1, and that’s basically what he’s described to me. He eats a a lot of sugar during training and racing without issue. The issue for him is once he’s stopped working out he has to be careful with what his blood sugar does for the next hour or so. I’ve literally had him pass out on me after a 70.3 because his blood sugar dropped so low. Gave him a coke and 10 minutes later he was fine.
From my understanding, during exercise (and why it’s good for diabetics) your body’s insulin respond is basically shut down. Your muscles are taking up the glucose and there should not be any spike in blood sugar. A good friend I train with is type 1, and that’s basically what he’s described to me. He eats a a lot of sugar during training and racing without issue. The issue for him is once he’s stopped working out he has to be careful with what his blood sugar does for the next hour or so. I’ve literally had him pass out on me after a 70.3 because his blood sugar dropped so low. Gave him a coke and 10 minutes later he was fine.
Now I wonder why people aren’t passing out when on a ketogenic diet, As far as I know type 1 & 2 different, that is perhaps keto diet bad for type 1 since ketoacidosis can happen, although then I tried to google is and see some type 1 people have been studied on a keto diet.
on my last blood work, my blood sugar was int he “Pre-Diabetes” level.
I am working to curtail this in my day to day life, but wondering what effect my on the bike nutrition has on this? Or how I should change my nutrition to facilitate improvement in this health metric
Could you give some more information here? Was this an A1C test ( I am guessing your A1C was a bit high)? What kind of training and/or racing are you hoping to do? Sprint/olympic distance, ironman distance, etc? Do you have a background in endurance sports and training, or is this a new pursuit for you?
In general, you are going to use up the calories you are consuming on the bike, so don’t be afraid to fuel properly with sugars. It is the time outside of training that you will need to alter in terms of your nutrition. First step- cut out sodas, juice of any kind, and junk sugars and sweets. This is of course just general advice, not knowing anything about your diet, background, training, or history.
If its really bike nutrition and not pre-diabetes, its pretty easy to check. Get a script for any cgm or get a Stelo if they’re available, wear one of them, and you’ll be able to tell if you only see spikes during workouts, or if its high overnight or postprandial. The technology is too good these days to guess.