 Although the levels of dioxins and PCBs continue to decline, there is one dietary source that still remains a threat—fish. Everything eventually washes into the sea. Yes, we can get some from eating horses, but most of human dioxin exposure comes from eating fish. The World Health Organization puts the tolerable upper daily limit of intake at one picogram, one trillionth of a gram. As you can see, just eating dairy, and we're already skirting with a max, and fish takes us straight over the top. Everyone agrees that the Omega-3 fatty acids like DHA found in fish are healthy, but given the industrial contaminants in fish, as a recent analysis in food and chemical toxicology concludes, so if people choose to get their recommended long-chain Omega-3 intake from fish, the majority of consumers would exceed the safety limits for dioxins and dioxin-like substances, like PCBs. And just like with eggs, in last year's update, factory-farmed fish have significantly more dioxins. In fact, for every toxin tested, farmed fish are at higher levels of DDT, and these other banned pesticides, over 10 times more PCBs, 10 times more dioxins than wild-caught fish. Aquaculture fish can be considered farmed and dangerous.