Canned tuna can improve conditions related to diabetes cancer & even depression. Studies have shown those who eat tuna 2X pr week are less prone to a heart attack & can lower triglycerides. Tuna is important for a person who diets because of the omega 3's B vitamins& healthy unsaturated fats. Pick tuna canned in water or a pouch. Too much tuna is not good for those who get gout as tuna has purines. Mercury too so dont eat it every day!