To my knowledge PCBs aren't a significant concern in wild-caught fish. They may be somewhat more prevalent in farm-raised fish, which typically have a lower con

To my knowledge PCBs aren't a significant concern in wild-caught fish. They may be somewhat more prevalent in farm-raised fish, which typically have a lower concentration of vitamin D anyway (and would therefore be of less benefit). Suffice it to say that I don't believe it's accurate to argue that eating "more fish" will result in "high levels of toxins" — if someone is eating little to no fish and integrates some quality fish into their diet, that's very unlikely to result in the consumption of unsafe levels of toxins. Of course, when it comes to fish, and especially with concern to mercury, over-doing it is very possible.