I feel pretty good about it. I eat four or five cans a week. No one should eat more than 7 ounces of shark or swordfish a week, and no more than 14 ounces of grouper, marlin or orange roughy. Women of childbearing age should eat shark or swordfish or fresh tuna no more than once a month. Also, these women should have no more than 8 ounces of canned tuna a week.
Fresh tuna can have more mercury than the canned variety.
Tuna is an excellent source of omega-3 fatty acids and is low in fat, but it looks like you might be eating 30 ounces a week. Large fish, like fresh tuna and swordfish, have the highest levels of mercury. Large amounts of mercury can cause brain and nerve damage in fetuses and young children. Maybe you should consider something different for lunch twice a week to reduce your risk of exposure. This information is not intended to be a substitute for professional medical advice.