Why am I getting an insulin spike/ sugar rush?

[Bad Dog]

I have been trying to have oatmeal, and a half cup of raw frozen unsweetened strawberries with splenda in the morning but I am getting one hell of a sugar rush when I do it. They are both supposed to be very low on the glycemic level or maybe it's high I can never remember how that thing works. Anyway I should not be getting a sugar rush from it but I am and I am not enjoying it. It makes me sleepy and lethargic for about 2 hrs.
The only other thing I am eating with it is 3 boiled egg whites..

Yes, I can give it up but I want to know why it is happening.

 

[Stu]

try combining it with some fats

 

[Bad Dog]

try combining it with some fats

That makes sense what you suggest as a fat, maybe leave in one of the yolks from the eggs??

 

[Gordo]

That makes sense what you suggest as a fat, maybe leave in one of the yolks from the eggs??

Yup.

Not sure how it would taste with strawberries...but....crushed walnuts and blueberries in oatmeal is nice.