But yogurt tasted with that spoon was also rated as less sweet than when eaten with heavier or larger spoons.
I have been always wondering what this kind of as is called grammatically, e.g. adverb, adverb clause, preposition etc. If it is a preposition, does that mean there is being omitted between as and less since there should be a noun to come after the preposition as ? Or, is it an adverb clause ? How to clarify it?