When You Eat Tuna Every Day, This Is What Happens

Tuna is an affordable seafood option that can be used in everything from sushi to casseroles to sandwiches. This fish is high in protein and low in fat, making it an appealing option to people on certain diets. But it also comes with some controversy. The biggest concern about tuna is the risk of mercury poisoning. All seafood contains trace amounts of mercury, which is found in seawater and gets absorbed by ocean life (via Vice).

When too much of this metal is consumed, it can cause poisoning and various health issues. Because tuna are large fish, they tend to absorb a lot of mercury before they are caught and sold to consumers. But according to Vice, you would need to eat a lot of canned tuna to experience toxic levels of mercury. "Tinned tuna is a very low source of mercury, so people would have to be eating at least three cans a day for about six months before it really became a concern," Melanie McGrice, an accredited practicing dietitian, said. "Even pregnant women, who are one of the cohorts most at risk of mercury toxicity, can eat a small, 95-gram can on a daily basis throughout their pregnancy without concern of mercury toxicity."

You should be able to eat small amounts of canned tuna every day without issue, but Medical News Today recommends waiting three to seven days between eating tuna based on your body weight.

The health benefits of tuna outweigh the risks

Because your risk of mercury poisoning is relatively low, you shouldn't avoid this food if you like eating it. Tuna is packed with health benefits and is a great option to add to your diet. According to Eat This, Not That!, tuna is high in lean protein, which will help you feel fuller after eating and eat fewer calories in the long run. Tuna contains important omega-3 fatty acids that assist with brain and eye function.

According to WebMD, tuna is high in vitamin B12, which helps with the formation of red blood cells and can prevent anemia. It is also a good source of iron, vitamin B6, potassium, selenium, and iodine. Avoid canned tuna that contains added oil or salt, which are common preservatives. These can add calories to your tuna dish and cause bloating and weight gain. Stick to tuna that is canned in water. You can add tuna to salads or sandwiches as a decent protein boost. You can also use canned tuna to make a tuna burger for a leaner option than beef.