Mercury and Omega-3s Come From the Same Fish

The fish giving you omega-3 fatty acids is the same fish loading you with mercury. That's the impossible trade-off millions of people face.

The Northern Canada Data

A 2026 study in Int J Hyg Environ Health measured mercury, selenium, and omega-3s (EPA and DHA) in people from three northern Canadian communities. Fish and waterfowl consumption drove both mercury levels and omega-3 levels up together.

The correlation between mercury and EPA+DHA was moderate to strong (0.36 to 0.65) across all three regions. You can't get one without the other from the same food.

Fish Is Both Medicine and Poison

Age and eating at least one species of fish or waterfowl were the strongest predictors of hair mercury levels. The same dietary pattern that protects your heart with omega-3s is contaminating your body with a neurotoxin.

Caribou livers and kidneys drove selenium levels higher, showing that traditional diets in remote areas carry complex risk-benefit profiles.

The Real-World Dilemma

People can't just "eat less fish" when fish is a cultural staple and their best source of essential nutrients. The problem isn't the fish. It's the mercury we've put in the water.

What You Can Do

Choose smaller, shorter-lived fish (lower mercury). Consider fish oil supplements tested for mercury. And use non-toxic kitchen alternatives for food preparation to avoid adding other contaminants.

Also see glass food containers for safer alternatives.

Source: Packull-McCormick et al. (2026). Int J Hyg Environ Health.