I was sat having my meal last night and saw someone eating a scoop of ice cream
I'm type 1 and I was wondering how much more insulin I should inject at meal time if I wanted one scoop of strawberry ice cream I won't be making a habits of this but once a week would be nice
You might be in luck. Frank's do just two flavours of diabetic ice cream and strawberry is one of them. I've picked it up in Holland & Barretts and Tesco. I should probably mention that I'm in Wales and that seems to be its sphere of activity. I mention that by way of a possible explanation for not being able to find it.
This has been discussed elsewhere at viewtopic.php?t=14762 There is some concern there about the level of carbs but I think the more important thing is whether it causes elevated BG levels.
UPDATE:
Of course, if you are in Thailand, something I've just spotted on another post - then, never mind. I'll leave this here for others though, if you don't mind.
I was sat having my meal last night and saw someone eating a scoop of ice cream
I'm type 1 and I was wondering how much more insulin I should inject at meal time if I wanted one scoop of strawberry ice cream I won't be making a habits of this but once a week would be nice
It depends on a) how much ice cream, and what type. That affects how much carbohydrate is in it. The richer, creamier ice creams sometimes have lower carbs than the cheaper versions because they are higher in fat.
b) what your insulin to carb ratio is
For me, my ratio is a reasonably typical 1:10 (ie 1 unit of insulin covers 10g carbs) so if I couldn't see the pack and wasn't able to measure the amount of ice cream I'd go by one small scoop being 10g and cover it with 1 unit, then test after 2 hours and 4 hours to see what the effect was. If I wasn't trying to lose weight, I wouldn't let diabetes stop me enjoying ice cream, especially after a meal, when the effect of the sugar would be moderated by the meal.