Tuna causes a miserable and painful ailment in cats called steatitis.
Cats easily become 'tuna junkies' as the oil is very addicting.
Tuna is considered a cat allergen and can cause all sorts of illnesses - epilepsy, asthma, hyperactivity and skin troubles. It also causes heavy metal intoxication with such high amounts of mercury that leads to chronic UTIs, liver, kidney and pancreatic damage. Tuna destroys the cats vitamin E stores and can also cause a muscular dystrophy-like ailment called steatitis. The heavy metal poisoning is also a problem for us lowly humans as well. The fact that it's in aluminum cans is dangerous, too.