Explanation for my downvote: The article you linked is more ideology than research. If you had linked to the original research I could have something to criticize - the absence of basic controls in evaluating the state of health, for example, like comparing life expectancies of like groups - say, Japanese-descended men living in US to Japanese men living in Japan.
As it is, however, there are so many objectionable and poorly-defended statements (like the implication that the lack of gun control contributes to lower life expectancies, or the suggestion that a government-rendered diet would improve public health) that leave the article linked more politics than science that there's no one point of objection. It's just a mashup of ideological applause lights.
Like the implication that the lack of gun control contributes to lower life expectancies
The US has a murder rate about four times that of the UK.. If as a rough approximation half of that is due to gun control issues, that would correspond to an extra around 6,000 deaths yearly. Around 2.5 million people die in the US yearly. Victims of violent death are much more likely to be young but even if one assumes that the additional deaths are all infants, that's on the order of 3 months less of life. Even if one assumes that all differences in murder rate are...
Of course, it turns out they're actually last among developed nations in real health outcomes.