Tuna can make for a healthy meal, but there are certain types of tuna that you are better off avoiding when eating out at a restaurant. Here's what to look for.

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According to the latest data, among the seven principal tuna species, 33.3 percent of the stocks are estimated to be fished at biologically unsustainable levels That is why in December 2016 ...

"The further up the food chain you go, the more mercury is accumulated, so when you get to the top, you find the highest levels, including in tuna but also in species like swordfish and shark.” ...