24. Canned Tuna
Though tuna provides a ton of health benefits, as it contains omega-3 fatty acids, protein and vitamin D, there are some drawbacks, and eating the canned version of the fish definitely isn’t so beneficial.
All tuna contains some mercury, but some forms of tuna have less. As a general rule, researchers have found that the bigger the tuna the more it will contain, as bigger fish eat smaller fish, so the amount of mercury that accumulates will be higher. Mercury poisoning has extremely serious effects, including memory loss and seizures and because of this, pregnant women are warned not to consume tuna at all, as it can cause developmental problems for their baby.
The canned version of tuna is particularly bad for you, as the chemical bisphenol-A (BPA), which is used in the lining of the can. BPA is toxic and many researchers have linked it to multiple serious disorders. Scientists from the University of Missouri found it can encourage the growth of hormone dependent tumours and cause endocrine disorders, and when it’s used as a can lining agent, this toxic chemical can leach into the food contained within. It’s clearly a good idea to give canned tuna a miss, but in general, though tuna that’s not canned won’t contain BPA, you should still eat it in limited amounts, because of the mercury in the fish.