Blood Sugars & Biking

If you’ve been following my instagram, you may have heard about how I just got a new job and that I am fortunate enough to be able to bike to and from work. It takes me about 25-30 minutes each way, and it’s mostly flat! …thank goodness. I am not pressured to be there at a certain time, and I’m also not biking super fast.

So what the heck is up with my blood sugars?
Here are three examples from my five-day work week.


At least I don’t over-treat my lows!

I once started at a solid and level 121, and when I got home I was 44. Thankfully I made it home. 

I also started at 142, and ended at 60. AGAIN, thankfully I got home.

This one I also find crazy, starting at 207 (oops) and ending at a nice 87. This one I’m definitely okay with, minus the high BG, but ending at 87 is nice. However, it is still a HUGE drop.

In all situations I suspended my pump during the duration of my bike ride. It just seems like no matter what I do, I drop at least 80 mg/dl. I don’t even have any major active insulin, as I eat lunch at 12:30 and ride bike home at 4:00 or later.

UPDATE: I now eat 2-3 gummy bears (10g carbs) before I start my bike ride, and this has worked well. Trial and error is key.


p.s. I use the app MySugr for logging all my meals, blood sugars, and activities.



  1. I’m on MDI but I get this often myself. I am hypo-unaware while exercising and have had a couple of close calls of almost fainting once I stopped pedaling.

    I’m not very knowledgeable on pumps, but maybe your insulin on-board is still high enough to cause these drops even when you suspend the pump during exercise? I’ve had to lower my bolus before a meal and the following exercise to avoid this from happening. (I try not to eat extra carbs for exercise.) Lowering my bolus has helped out more than eating extra for me.


    1. I have no insulin on board when I begin my bike. Lunchtime is usually 4 hours before I start biking again. I tried turning my pump off 15 minutes before I left yesterday and that seemed to help. Trial and error, but hoping for no error 😜


  2. Very strange. Looking forward to hearing what your endo has to say. I usually drop low when I exercise in the afternoon but I’m not on the pump so I put it down to peaking basal.


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