The answer to this question lies in how much sushi you have on a weekly basis. Having too much sushi in the diet predisposes a person to mercury poisoning symptoms. Excessive sushi consumption will not help in any way to derive its health benefits. Sushi contains all the essential nutrients for a healthy living but that doesn't mean you can eat as much as you want. How many times you have sushi every week is a deciding factor in, whether you will suffer from mercury poisoning symptoms. To prevent mercury toxicity, one has to reduce servings of sushi. To be on the safer side, avoid having sushi everyday in meals. If you want to have sushi meals, choose any 2 days of the week. Also, once you eat sushi at lunch, do not have it again at dinner. Eating sushi in moderate amounts, twice a week will cause no harm to your health.
Read more at Buzzle: http://www.buzzle.com/articles/mercury-poisoning-from-sushi.html