Calories and flavour aren’t one and the same; something can have a taste without having meaningful calories (as another comment points out, your body needs to be equipped to process a given compound to derive energy from it). And a lot of things are so flavour dense that you don’t need to reach a meaningful amount of energy for it to taste really strongly – hot peppers are a good example. Many hot sauces are made mostly of peppers and vinegar, which do have caloric value, but the serving sizes are so small that the amount of calories you ingest from them is negligible and the manufacturer is able to round the reported calories per serving down to zero.
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