1. Raw Fish
Cats eat meat and fish is meat so feeding them nothing but fish should be fine, right? Unfortunately, no. Cats won’t get all the nutrients they need out of fish alone. Not only that but too much tuna can lead to mercury poisoning thanks to traces of mercury in the meat and too much fish overall breaks down the essential vitamin thiamine in their system. A little fish here or there is fine as a supplement but don’t depend on it, and definitely avoid giving your cat fish that’s been prepared with breading, oils or herbs – these can all cause health problems.
Raw fish can cause gastrointestinal upset in cats and even lead to neurological problems. This is due to the thiaminase in raw fish that can break down the vitamin B’s in your cats system causing a deficiency.