That's an extreme example, but the idea is that the food in question provides calories without nutrients. So there is such a thing and it makes plenty of sense.
(USDA takes my side: http://www.choosemyplate.gov/weight-management-calories/calo...)
A spoonful of sugar contains 100% nutrients.
That link is total nonsense. For example it claims pizza is empty calories, but bread, cheese, tomatoes, meat & veggies are not? It's ridiculous.
Which I thought was implied. But I forget that imprecise communication works less and less.
It does not contain any minerals, vitamins, protein, essential fatty acids, micronutrients or antioxidants, which in the context of this discussion, is what is meant by saying it has no nutrients.
> While there is still some debate in the area, researchers have assigned a caloric value to fiber of 1.5-2 cal/gram (depending on the specific type).
Source: http://www.bodyrecomposition.com/nutrition/fiber-its-natures...