Smoking was like as bad for you in terms of mortality as having a low omega-3 index. This Harvard study identified not eating enough seafood as one of the top six preventable causes of death. Up there with not having hypertension, not smoking.It's one of those things where people just don't think about what they're not eating, what they're not getting. People with what's called a high omega-3 index, which is a lot of omega-3, a lot of omega-3, their omega-3 index would be 8% or higher, that's considered hig ...