a person who knows how to eat big food must learn how to?!

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What are you asking exactly?
Watch their portions and not be greedy? And exercise to make sure they don't get fat?
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I'm not quite sure what your asking there partner. But eating fish is very easy. Just make sure you don't eat any bones. Depending on how you cook the fish. But there isn't any secrets or any arts to master when it comes to eating fish. Just a taste for fish!