In general, it is safe for all population groups, including pregnant women, to consume 2-3 serves of any type of tuna per week (canned or fresh). Canned tuna generally has lower levels of mercury than other tuna because the tuna used for canning are smaller species that are generally caught when less than 1 year old.
Canned light tuna is in the “Best Choices” category and it is fine to eat 2 to 3 servings per week. We recommend that you eat a variety of fish. You may wish to try other affordable fish in the “Best Choices” category such as canned salmon or sardines, frozen fish, or fresh fish that are at a reduced price.
Takeaway. Certain types of tuna are high in mercury, which can have harmful effects on health in high amounts or in certain populations. For most healthy adults, it's recommended to consume at least 2 servings of fish per week, which can include tuna.
Depending on how much and, especially what kind of canned tuna you're eating, you may be getting too much, potentially resulting in a fishy side effect called mercury poisoning. But before you dis fish, read on, and check out these 6 Ways Eating Fish Can Help You Lose Weight.
In general, it is safe for all population groups, including pregnant women, to consume 2-3 serves of any type of tuna per week (canned or fresh). Canned tuna generally has lower levels of mercury than other tuna because the tuna used for canning are smaller species that are generally caught when less than 1 year old.
Canned white, or albacore (0.32 parts per million of mercury). Children under six can eat up to one 3-ounce portion a month; children from 6-12, two 4.5-ounce portions a month. Adults, including pregnant women, can safely eat this kind of tuna up to three times a month (women, 6-ounce portions; men, 8-ounce portions).
All but one of the light tunas in our tests had levels low enough that CR's experts think that, assuming no other fish is consumed, adults who are not pregnant could eat three 4-ounce servings a week, and children could eat two 1- to 4-ounce servings (depending on age).
Symptoms of mercury poisoning depend on the form of the mercury that was the source of the exposure. Early symptoms of mercury poisoning can include a metallic taste in the mouth and numbness and tingling in the hands, feet and face.
If you're concerned about limiting the amount of mercury you consume, and if you've eaten no other fish during the week, Consumer Reports says up to 12 ounces a week of Bumble Bee Chunk Light, Chicken of the Sea Chunk Light, Safe Catch Wild Elite, and StarKist Chunk Light tunas are the safer choices among the products ...
If you're counting calories and maximizing omega-3 fatty acids, then tuna in water might make a great choice. On the other hand, if moisture, flavor, and vitamin D levels are your focus, then olive oil-packed tuna might be better. Whatever tuna you choose, it's important not to go overboard for this mild-flavored fish.
This may leave you wondering if eating canned tuna is safe, but the FDA says adults should be fine eating one or two servings a week, as long as those who are pregnant or breastfeeding avoid tuna and other fish that may contain mercury.
King mackerel, marlin, orange roughy, shark, swordfish, tilefish, ahi tuna, and bigeye tuna all contain high levels of mercury. Women who are pregnant or nursing or who plan to become pregnant within a year should avoid eating these fish. So should children younger than six.
In tuna flesh, mercury essentially occurs as methylmercury, which is the organic form of mercury that builds up naturally as tuna grow older and bigger; this process is known as bioaccumulation. Methylmercury is eliminated by marine organisms at a slower rate than it is accumulated (see Box 1).
1. Is canned tuna fish good for you? Yes, canned tuna is a healthful food rich in protein and contains many vitamins and minerals such as B-Complex vitamins, Vitamins A and D as well as iron, selenium and phosphorus. Tuna also contains healthy omega 3 essential fatty acids DHA and EPA.
Once in the body mercury has a half-life of ~3 days in the blood stream and a 90 day half life in other tissues (e.g. brain, kidneys, etc).
A large overdose of inorganic mercury may cause massive blood and fluid loss, kidney failure, and likely death. Chronic brain damage from organic mercury poisoning is difficult to treat. Some people never recover, but there has been some success in people who receive chelation treatment.
The traditional treatment for mercury poisoning is to stop all exposures. In many cases, chelation therapy is also used. This involves giving a medication (the chelator) which goes into the body and grabs the metal (chelos is the Greek word for claw) then carries the metal out of the body, usually into the urine.
They recommend that people who are not pregnant eat no more than one to two cans of albacore per week, depending on brand, but that up to three cans per week of most brands of chunk light tuna are fine. Chicken of the Sea, Safe Catch, and Starkist brands showed lower levels of mercury in their tests.
Unopened cans of tuna should be stored at room temperature, away from heat sources. Once opened, leftovers should be placed in an airtight container and refrigerated for 3-5 days.
Since tuna is relatively high in mercury, one can per day would bring you to the FDA suggested maximum amount of mercury. Having more than that on occasion may not be a problem, but you are at risk of getting low dose sustained mercury poisoning.
Blood mercury levels above 100 ng/mL have been reported to be associated with clear signs of mercury poisoning in some individuals (e.g., poor muscle coordination, tingling and numbness in fingers and toes).
The Dietary Guidelines for Americans recommends: At least 8 ounces of seafood (less for children§) per week based on a 2,000 calorie diet. Those who are pregnant or breastfeeding consume between 8 and 12 ounces per week of a variety of seafood from choices that are lower in mercury.