《中國居民膳食指南（2016）》建議，成年人每日攝入的鹽應少於6克，——這個建議（鹽應少於6克）反而會升高血壓。

因為，6克的鹽，相當於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.