US red meat consumption has been in decline since 1980, which was the peak year for beef. But instead of trading into fish and seafood, consumers are opting for chicken and -- most recently -- more plants, according to Arlin Wassermann, founder of Changing Tastes.

In a bid to avoid "harmful ingredients" and eat more sustainably, today's "most relevant sustainable food choices are chicken and plants," he said.

So fish and seafood is in danger of being left out when it comes to the next big thing in eating habits.

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