Hey, new guy here! I just recently discovered Mark's work and it is vindicating because I have evolved a routine that nearly mirrors the primal blueprint, just from paying attention to my body and eating things I think are reasonable.
Sardines seem like a perfect primal food; you eat the flesh, bones, skin, organs. Also, because they are so small, they dont build up the levels of environmental toxins that larger fish do.
My question is whether canned sardines have any potential issues. Provided that you avoid added sodium or other junk, how safe are sardines in spring water or olive oil? Are there toxins to worry about from the canning process?