People consuming fish and fish oil may exceed the World Health Organization’s daily safety limit for dioxins and dioxin-like substances, such as PCBs, which reduces value of fish as a DHA source. In fact, fish oil may be so contaminated, it may even increase inflammatory markers, so much so that it may be not be able to counteract the adverse effects on mood caused by the arachidonic acid in fish. Other industrial toxins may include endocrine-disrupting pollutants and heavy metals such as mercury. Although tuna companies advertise tuna as safe and healthy for us and our children, they appear to just be employing the same techniques that chemical companies have used to try to suggest that pesticides, such as DDT, are safe and healthy. Omega-3 fatty acids are therefore best obtained from fish-free sources, such as microalgae-based DHA. Long-chain omega-3 fatty acids are no longer found in sufficient quantities in chickens due to genetic manipulation.
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