I've been finding contradictory information about sodium intake, one source states less than 3 g or more than 7 g is associated with heart related problems and higher mortality while other sources say less than 1500 mg sodium intake is advised and others that say otherwise. Did hunter gatherers have shorter lives due to low sodium intake? Also some sources state that low carb diets increase sodium intake. So how much is adequate? My sodium intake has been low being usually less than 1500 mg.
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Below 1500 mg, observational studies have seen upticks in problems. And in some populations, high sodium levels (2300+ mg) also cause problems. Sodium is essential, but in high amounts it's problematic - just like every other nutrient.