Daily consumption of large predatory fish like tuna exposes one to a dangerous accumulation of heavy metals, making it necessary to diversify protein sources and prioritize fish from lower trophic levels.

noli's read

There is a strong consensus that an ultra-repetitive diet, even one perceived as healthy, carries invisible risks. Scientifically, this observation is sound: large predatory fish are indeed at the top of the food chain, which promotes the bioaccumulation of methylmercury, as attested by public health recommendations (such as those from the FDA/EFSA based on observational studies). If sardines are recommended as an alternative, it is because they occupy a lower trophic level and contain significantly less mercury, while being rich in omega-3s. The idea that tuna is a "perfect" food is an oversimplification that neglects food toxicology. Conversely, the advice suggesting that cilantro could effectively chelate (eliminate) ingested mercury lacks robust clinical evidence in humans and falls more into the realm of popular belief. Finally, caution is warranted regarding the idea of consuming specific foods to "compensate" for potential toxicity rather than simply varying one's diet.

the sources

1. 1r/Biohackers