I am Italian and, living in Scandinavia, apart from being mostly disgusted by the other chocolate spreads, I am always very surprised to see the office managers, offering breakfasts on select days, defaulting to a teaspoon in the Nutella jar.
I grew up with a taboo for that and the only way I would ever have Nutella is by scraping some with a knife-side and spreading it thinly on a slice of bread.
It's funny to see people do such things and then coming with the question: "you Italians have pasta, pizza and Nutella and you still manage to be so thin. How?!"
Check your portions.