Although the levels of industrial pollutants like dioxins and PCBs continue to decline in the food supply,

there is one dietary source that still remains a major threat, fish. Everything eventually

flows into the sea. Yes, we can get some dioxins from eating horses, but most of our exposure comes from

eating fish.

The U.S. Environmental Protection Agency puts the tolerable upper limit of dioxin intake per

kilogram of body weight at 0.7 picograms, less than a trillionth of a gram per day.

So we should get less than this in our diet every day.

As you can see, we're already skirting the max by just consuming dairy,

and fish takes us right over the top, even at low levels of consumption.

So the adverse effects of chemical contaminants in seafood may counteract the benefits

of any nutrients in fish, so much so that many dietary guidelines recommend no more

than one serving a week of fish and seafood to cut down on exposure to toxic pollutants.

But which is worse, wildcote or farmed?

Take salmon, for example.

Salmon had the highest toxic equivalence of PCBs, followed by canned tuna, as well as the

highest neurotoxic equivalents of PCBs.

If you compare the levels of PCBs in salmon farmed in Maine and Canada versus salmon wildcot in Alaska versus

organically farmed salmon from Norway.

Compared to wild-cut salmon, the farmed salmon, organic or otherwise, had significantly higher

PCB levels.

This appears to extend to other contaminants too, based on the testing of literally tons of

salmon samples from around the world, for every toxin the researchers tested.

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