Thanks both!
I didn't do that much training in advance (and certainly not as much as I should have done) - I run c. 5km fairly regularly (3 or 4 times a week, usually) and did a couple of long runs as prep for the half but should have done some more distance training to improve my endurance. I did manage a time of 1hr45 (a PB for me) but ached afterwards and pushed myself fairly hard.
I had a small bowl of cereal and a banana with 2 units of NovoRapid at 5.30am and the race started at 7am. The cereal and banana would usually be 3.5 to 4 units for me, so I reduced down to 2 because of the marathon. I guess I should have reduced further given that my levels kept dropping during the race. The night before the race I reduced my Lantus from the usual 14 units to 9 units; perhaps that also played a part in the post-race highs and I should have left it at 14 and done without the NovoRapid instead?
@Bebo321 I definitely do become significantly insulin resistant when my levels go above around 10mmol. I've now learnt that when I'm in double figures there is basically no point in injecting anything less than 3 units as it simply doesn't do anything.
Firstly, it depends on the portion size and post-meal activity level and secondly, everyone has their own ratios. As I mentioned in my initial post, I have tried and tested this meal many times in the past and 6-8 units has always served me well (usually as a 3 unit pre-bolus and 3-5 unit post-bolus).6U for a burger and fries ain't enough (as you ultimately found out). Takes me about 12 too. Fries are killer for blood sugar dude!
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