How can I safely incorporate canned tuna into my cats' diet?

To safely incorporate canned tuna into your cats' diet, make sure it is in water and not oil, as oil can cause digestive issues. Limit the amount to a small portion as a treat, as tuna lacks essential nutrients for cats and can lead to Mercury poisoning if consumed in excess. It is best to consult with a veterinarian before making any changes to your cats' diet.