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).
Eating more than the advised amount of tuna each week can result in increased exposure to the neurotoxin. Mercury poisoning can cause several concerning neurological symptoms, including coordination loss, memory problems, seizures, and tremors.
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.
But how many tins a week? Lab tests we did for the ABC TV science program Catalyst in 2015 suggest — depending on your body weight and the exact brand of tuna you buy — you could eat anywhere between 25 and 35 small tins (95g each) of tuna a week before you hit maximum mercury limits.
The United States Food and Drug Administration recommends keeping the consumption of albacore (white) tuna to under 4 ounces per week and skipjack (light) tuna to under 12 ounces per week. These amounts should be lower for children and women who are or may become pregnant.
Tuna: if you are trying for a baby or are pregnant, you should have no more than 4 cans of tuna a week or no more than 2 tuna steaks a week. This is because tuna contains higher levels of mercury than other fish. If you are breastfeeding, there is no limit on how much tuna you can eat.
Canned light tuna is low in mercury and is considered one of the best choices for individuals that need to limit their exposure to mercury. People who are pregnant or breastfeeding can consume 2–3 servings of canned light tuna per week and children can consume 2 servings per week.
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.
Canned light tuna contains the least amount of mercury, and the FDA suggests limiting yourself to no more than 12 ounces a week, or no more than three 5-ounce cans.
But methylmercury is a powerful neurotoxin, so eating too much fish may result in mercury poisoning. Symptoms include itching or a pins-and-needles feeling in the toes and fingertips, muscle weakness, coordination, speech and hearing impairment, and reduced peripheral vision.
Most of the metallic mercury absorbed into the body eventually leaves in the urine and feces, while smaller amounts leave the body in the exhaled breath.
"While canned tuna, especially light varieties, has relatively low average levels of mercury, individual cans can sometimes have much higher levels," Consumer Reports said.
The recommended daily dose of canned tuna is not so small, as it corresponds to 50-60 grams, and in an even broader sense, the weekly dose should not exceed 170 grams, as recommended by the World Health Organization health.
The FDA recommends consuming fish lower in mercury. For tuna varieties, skipjack earns the Best Choice label from the FDA, while yellowfin and albacore receive the Good Choice label. The FDA suggests avoiding bigeye tuna, which has the highest levels of mercury.
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.
The science shows that there is no reason bodybuilders should cut tuna out of their diets due to the current mercury scare. One can of chunk lite a day is a reasonable and safe intake for a 200lbs man without the risks of any health problems.
Summary. Fish that contain high levels of mercury include shark, ray, swordfish, barramundi, gemfish, orange roughy, ling and southern bluefin tuna. Mercury is a naturally occurring element that is found in air, water and food.
You would have to eat around 25 tins (at 95g a tin) of it a week before you hit the maximum tolerable intake of mercury. For pregnant people (or people trying to get pregnant), the limit would be around 12 tins (at 95g a tin) a week.
Overexposure to methylmercury can cause symptoms, such as loss of peripheral vision, muscle weakness and impaired speech, hearing and walking, according to the Environmental Protection Agency (EPA).
Fish. Ironically, eating fatty fish helps combat a fatty liver. Salmon, sardines, tuna, and trout are all high in omega-3 fatty acids, which can help lower the levels of fat in the liver and reduce inflammation.
The inhalation of mercury vapour can produce harmful effects on the nervous, digestive and immune systems, lungs and kidneys, and may be fatal. The inorganic salts of mercury are corrosive to the skin, eyes and gastrointestinal tract, and may induce kidney toxicity if ingested.
"All fish have some level of mercury, but that level varies widely; canned tuna has relatively high levels of mercury so its consumption could potentially become harmful above three or so servings a week," says Andrea Paul, MD, medical advisor to Illuminate Labs.