From Ocean Pollution to Your Dinner Plate

The ocean is a dumping ground. And everything we throw in it comes back to us through the seafood we eat.

What's Actually in Your Seafood

A 2026 review in Mar Pollut Bull put numbers on the contamination. Bivalves (clams, mussels, oysters) carry 0.2 to 5 microplastic particles per gram. Predatory fish contain 0.3 to 1.5 ppm of methylmercury. On top of that: PCBs, phthalates, and pathogenic microorganisms.

These aren't trace amounts. They're measurable levels of known toxins in food people eat regularly.

What These Contaminants Do to You

The review links seafood contamination to neurodevelopmental deficits (especially in children), cancer, metabolic disorders, and disruption of the gut microbiome. Methylmercury and PCBs are especially damaging to developing brains.

There's also something called microbiome-mediated toxicity. The pollutants change your gut bacteria, which then messes with your immune system and metabolism. The damage compounds.

How Contaminants Move Up the Food Chain

Small organisms absorb pollutants from the water. Small fish eat those organisms. Bigger fish eat the smaller ones. At every step, the concentration goes up. By the time it reaches a tuna or swordfish, the pollutant load is enormous compared to what started in the water.

How to Eat Safer

Choose smaller fish lower on the food chain. Limit shellfish from polluted waters. Vary your protein sources so you're not loading up on one type of contaminant. And check out non-toxic kitchen alternatives for cleaner food preparation.

Also see glass food containers for safer alternatives.

Source: Bhuiyan et al. (2026). Mar Pollut Bull.