
Texture is the first clue
Chunks can be too large, rubbery, cold, or hard to chew. A pate or mashed texture may be easier to test.
Updated
Wet food texture
A cat who licks gravy but leaves chunks may prefer the sauce, dislike texture, struggle with chewing, or feel mildly nauseated.
Do not just keep buying wetter food. Check whether the cat is eating enough complete food, whether chewing looks comfortable, and whether the pattern is new.

Chunks can be too large, rubbery, cold, or hard to chew. A pate or mashed texture may be easier to test.

Dropping chunks, chewing on one side, drooling, pawing at the mouth, or bad breath points past preference.

Gravy alone is not a complete diet. Measure what is actually eaten and discard leftovers before they dry out.

A sudden switch to only gravy, weight loss, vomiting, pain, or reduced appetite should move the question to your veterinarian.
Use tools that keep wet food fresh, small, and easy to inspect.
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The sauce may smell better, the chunks may feel wrong, or chewing may be uncomfortable. Watch intake and mouth-comfort signs.
No. Your cat still needs complete cat food. Call your veterinarian if your cat is mostly licking sauce and leaving the actual food.