That's an interesting question, yet seems somewhat difficult to study. Several studies show that couples in "hostile relationships" do heal slower than "healthy relationships" (fighting affects the immune system). But I haven't been able to find anything with data regarding immune responses in "hostile relationships" vs being single. Those in hostile relationships have already increased their lifespan, although the hostility was likely not present for the entire relationship.
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... those who had been divorced or separated were 27% more likely to die...
Than who? Would the people that died after a divorce have survived if they had stayed with their poisonous spouses? I doubt it.
That's an interesting question, yet seems somewhat difficult to study. Several studies show that couples in "hostile relationships" do heal slower than "healthy relationships" (fighting affects the immune system). But I haven't been able to find anything with data regarding immune responses in "hostile relationships" vs being single. Those in hostile relationships have already increased their lifespan, although the hostility was likely not present for the entire relationship.