A Hole Lot Of Guessing

(I am a type-one diabetic and have been for 18 years. I am using an insulin pump, and to give myself correct amount of insulin, I have to calculate the amount of carbohydrates I have eaten. Note that carbohydrates represent a half of the weight of a piece of bread. This happens when I come home from school with hypoglycaemia when I’m 11.)

Dad: “What have you eaten today? Did you give yourself the right amount of insulin?”

Me: “Well, I ate a piece of bread and gave myself insulin for a third of its weight.”

Dad: “Why?!”

Me: “It had large holes!”