Answer:
The answer is tuna.
There has been a research published in Nature which suggests that common fish foods like tuna, which contain a significant level of methylmercury (MeHg), will have very high concentrations of the neurotoxin in future decades. MeHg has a high health risks to all humans, and even more serious for fetuses. Fetuses can experience lifelong nervous system damage from exposure in the womb.
