The menu items were the same for each participant, Dr. Bray said, but a participant on the low-protein diet would have gotten more mayonnaise and less tuna in a tuna fish salad, while the high-protein diet was extra tuna with little mayonnaise.

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Choose your own ingredients from tender squid, plump prawns or juicy pork, topped off with bonito (fish) flakes, a thick brown okonomiyaki sauce and mayonnaise.

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