Tuna
Tuna is a high-quality lean protein with omega-3s, but FDA/EPA warn that tuna (especially albacore and bluefin) accumulates methylmercury, with consumption advisories for pregnant women and young children. Light/skipjack canned tuna is in the FDA 'Best Choices' list, while albacore is 'Good Choices' (1 serving/week limit).
What it is
Edible saltwater fish, primarily Thunnus species (yellowfin, albacore, skipjack, bluefin).
Whole-food protein source; consumed fresh, canned, or as sushi/sashimi.
Why it's flagged
- methylmercury accumulation
- consumption limits for pregnant/breastfeeding women and children
- fish allergen
What regulators actually say
"Albacore tuna, also known as white tuna, typically contains three times more mercury than canned light tuna. When you eat albacore... have only 1 serving and no other fish that week."
"Mercury occurs naturally in the environment and can also be released into the air through industrial pollution. It accumulates in streams and oceans and is converted to methylmercury, which builds up in fish."
Regulatory status
United States — FDA
Approved as food; FDA/EPA advisories limit albacore and bluefin tuna for sensitive populations.
European Union — EFSA
EFSA has set tolerable weekly intake of 1.3 µg/kg bw for methylmercury.
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