 What about all the other industrial pollutants like PCBs? And perhaps the largest study to date, more than 12,000 food and feed samples tested across 18 countries, in the 11,000 food samples tested, the highest mean contamination level was observed in fish and eggs. Fish and fish drive products followed by eggs milk in their products, and then meat and meat products from land-based animals. The lowest contamination was observed in foods of plant origin. That is reason enough, right there, to transition towards a plant-based diet. Here's the data. Fish oil just off the charts, 117 mcg per kg. Fish meat, 35 eggs, with quantifiable levels found in 94% of eggs tested. Dairy, beef pork chicken, and then plant foods, 0.08.