okay chicken littles
the amount of tuna and/or broccoli you have to consume to adversely affect your body would be realm of every meal every day for several months
eat healthy
stress less about mercury, pcb's, dioxin, thryoid-defeatism, blah blah blah
i find the more you worry about the minor crap the more likely you are to cause it to happen
and it is minor
consider all the people out there eating the way you do......are they dropping dead?