Are you implying ... or saying ... that the seafood was responsible for your heart attack? If not - why include that detail? If so - I would question what your diet and exercise was the rest of the year?
I've had seafood for Thanksgiving, because everybody wanted to go to Red Lobster. I've also had steak, pizza, Chinese, etc ... depending on the restaurant everyone wants to go to, or where they get the "platter" from.
I think the food less important than the gathering of friends/family.