The safety of seafood consumption faces unprecedented challenges as ocean pollution reaches critical thresholds that directly impact human health through dietary exposure. This comprehensive assessment reveals how contaminated marine food webs now deliver a cocktail of harmful substances to dinner plates worldwide, fundamentally altering the risk-benefit equation for fish and shellfish consumption. The quantitative evidence presents alarming exposure levels: bivalves like mussels and oysters contain 0.2-5 microplastic particles per gram of tissue, while predatory fish accumulate methylmercury concentrations reaching 1.5 parts per million. These pollutants undergo biomagnification, meaning they concentrate as they move up the food chain from plankton to the large fish humans consume most frequently. Persistent organic pollutants including PCBs and phthalates compound the contamination burden, creating synergistic toxic effects that exceed the sum of individual exposures. The health implications extend far beyond traditional mercury poisoning concerns. Chronic exposure through regular seafood consumption now contributes to neurodevelopmental deficits in children, increased cancer risk, and metabolic disorders in adults. Perhaps most concerning is the newly recognized pathway of microbiome-mediated toxicity, where marine pollutants disrupt gut bacterial communities essential for immune function and metabolic regulation. This represents a paradigm shift in understanding how environmental contamination translates to human disease risk. While seafood remains an important protein source, this analysis suggests current safety guidelines may inadequately protect consumers from the complex mixture of contaminants now ubiquitous in marine food webs, particularly for vulnerable populations including pregnant women and children.