Nutritionists recommend everyone to eat fish at least twice a week to get healthy benefits for the heart and brain. However, the good benefits sometimes make a person want to eat fish every day.
"For most people, it is fine to eat fish every day," said Eric Rimm, associate professor of epidemiology and nutrition director of cardiovascular epidemiology at the Harvard School of Public Health. "And certainly better to eat fish every day rather than eat beef every day."
However, Rimm said, pregnant women, for example, it is not advisable to eat certain types of fish every day. Fish with a larger size with longer lifetimes such as swordfish and tuna tend to accumulate toxins, such as mercury, he said.
"And it's not good for the developing fetus," said Rimm. For the same reason, the daily consumption of fish is also not good for the children, he added.
The amount of mercury would be far less on smaller fish with shorter life spans, according to Sinicrope Theresa Talley, a California Sea Grant researchers at Scripps Institution of Oceanography at the University of California, San Diego.
Mercury does not cause damage to organs function in adults, although it can cause transient neurological effects. However, in fetuses and children can be harmful to health.
"There have been reports of neurological problems from a place where people eat fish every day, such as dizziness or problems concentrating," said Rimm. "They probably eat sushi or tuna twice a day."
As for the question of whether to eat fish every day are healthier than twice a week, scientists are still investigating it, said Rimm.
"Most scientists do not see everyday consumption," he explained. "But many studies have shown that those who eat fish several times a week had a lower risk of fatal heart attack than those who did not eat fish."
The scientists say the benefits of a healthy heart thanks to the omega-3 fatty acids. These nutrients have also been shown to improve cognition in adults and helps in the baby's brain development.
To get the same healthy benefits, consumers should consider to eat smaller fish, shellfish, molluscs and even seaweed, said Rimm. Not only you can enjoy a more varied menu, but certainly no more healthy body.