Researchers at Texas Tech University reviewed how red meat proteins and amino acids affect human health, weighing both ...

Wilcox: The chutoro is getting around toward the side of the tuna, and it doesn't have the striations of fat, but it still has fat within the red of the meat, so you get a mix of fat and red.

While you may assume tuna's red color is an indicator of its freshness, it may be an indicator of something else entirely: a practice banned in other countries.