Less energy, fewer calories. My understanding is that it's not continuousness or discreteness that determines whether "less" or "fewer" is appropriate, but whet

Less energy, fewer calories. My understanding is that it's not continuousness or discreteness that determines whether "less" or "fewer" is appropriate, but whether the noun the word describes is a "count" noun or a "mass" noun. Mass nouns are just nouns you can't pluralize, but can refer to a multitude of something (you can't own "furnitures"), and count nouns are nouns that only refer to a multitude of things when plural.