[tyrfing]

Would straw or rock have excellent nutritional value, then?

[jefftk]

If you can't get anything out of it then it doesn't have nutritional value.

[thaumasiotes]

In other words, when we say "nutritional value", what we mean is carbohydrates.

This is something that everyone understands when we're talking about bears, but somehow forgets when we're talking about people. Those "empty" carbs are 99% of the reason you eat anything. "Nutritional value" and "energy content" are the same thing.