Quick peep while at the supermarket shows that on average any tuna in a gold can (Bumble Bee "Tonnio" or Star Kist "Select") does not contain soy. Well their labels read "fish,salt,water or oil...).
It seems that perhaps the better parts of the tuna are used for the TOL product and the leavings go into MOL and BOL product which is then stretched by adding soy and it seems also broth for flavour and filler. Oh at least in the case of soy it also ups the protein content a bit.
It seems that perhaps the better parts of the tuna are used for the TOL product and the leavings go into MOL and BOL product which is then stretched by adding soy and it seems also broth for flavour and filler. Oh at least in the case of soy it also ups the protein content a bit.