Nutella is filthy unhealthy. Yes, the fats in nut/peanuts aren't the bad kind, but its quantity is.
"it's quantity" is the same as peanut butter. Please do not even TRY to argue peanut butter is unhealthy.
Both are equally unhealthy if you eat it by the spoonful multiple times per day, but like all biologically important chemicals, moderation is a must.
Also, actually moving your ass is a must too. Most fail to accomplish much beside a little walking at the workplace (if that) - sometimes that isn't enough, if that's all you get day after day after day. Not if you care to remain remotely healthy when well beyond your prime.
So yes, if you are a fat slob and/or desire to achieve not even an iota of physical exertion throughout much of your life... it's probably not a good idea to eat much more than a serving of the stuff once every few days.
But honestly, those kinds of snacks (provided the amount of carbs are brought down) are better than high-carb snacks - because the slow digestion will help keep you feeling satiated for longer - which is a good thing to have in a snack.