If I understand correctly, this is a meta analysis – meaning that they're drawing conclusions based on pooling together existing research. The very first study

If I understand correctly, this is a meta analysis – meaning that they're drawing conclusions based on pooling together existing research. The very first study they linked was on something called the DASH diet, which in addition to reduced sodium encourages people to stay away from processed carbs and to favor whole grains. Basically, I'd want to dig in to the linked studies and get a better sense of how other factors besides sodium could be affecting the outcome. For instance, fast food contains a lot of sodium. To get to lower sodium, you'd probably have to cut down significantly on fast food. You'd drop the sodium, but you'd also be changing a lot of other variables. Salt makes food taste good. If you're cooking at home, you're probably not going to have to worry about salt unless you have a chronic condition of some sort. It just doesn't compare to the amount of sodium crammed into processed food. I'd rather focus on eating less processed foods, and season my home-cooked meals so they're not terribly bland. The high-order bit is to eat less processed foods.