What does a modern sailors diet consist of?

What do you mean by "sailor"?

Are you asking about an Arab fisherman, who plies his trade on a dhow in the red sea?

Are you asking about the crewman who's job is to keep the vending machines stocked on the U.S.S. Carl Vinson?

Are you asking about some poor Indonesian slob who serves as a wiper in the engine room of a panamax freighter?

Are you talking about the crazies who sail in the round-the-world Whitbread race every three years, or are you talking about the crewmembers in the relatively safe and sane America's Cup series?