Because some ingredients have no caloric value, i.e., there’s nothing in there our bodies can metabolize for energy. It doesn’t mean they have NO value, because there are minerals and electrolytes you need (like salt) that just aren’t something you can burn for fuel.
Yellow mustard is basically the same. Vinegar, water, salt, ground mustard seed and turmeric. Not much fuel there.
Now it’s not *completely* true that stuff has zero caloric value. Spices are mostly made from seeds, and the oils in the seeds technically have *some* caloric value, but it’s usually so low it’s not counted at normal serving sizes. If a serving of yellow mustard technically gives you 0.4 calories, they can just round down to zero on the label.
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