In moderation. Not something I eat every day. I usually go and get them fresh smoked.>>10314668
Mackerel is good food. Get some small ones fresh caught this summer, pan fry that bastard in butter, get fresh potatoes, make cucumber salad and add a splash of sour cream.
Canned in tomato sauce is good on bread, but it's not quite the same as fresh. Recommend you eat the whole can because it starts smelling rather fast.