《中国居民膳食指南（2016）》建议，成年人每日摄入的盐应少于6克，——这个建议（盐应少于6克）反而会升高血压。

因为，6克的盐，相当于2,400 mg 的sodium。

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A review of the Framingham Offspring Study found that too little sodium (less than 2,500 mg daily) raised blood pressure higher than it did for those who were eating higher amounts.1

The problem is that excessive salt restriction can cause dangerously high renin levels, a hormone secreted by the kidneys that regulates water and blood pressure balance. High levels of renin can cause the renal arteries to tighten and constrict, resisting blood flow and elevating blood pressure.