参考资料：
1.《中国居民膳食指南（2016）》
2.https://www.healthline.com/nutrition/different-types-of-salt#section1
3.https://ods.od.nih.gov/factsheets/iodine-consumer/
4.https://www.healthline.com/health/high-potassium-hyperkalemia
5.https://www.mayoclinic.org/symptoms/hyperkalemia/basics/causes/sym-20050776
6.http://healthyeating.sfgate.com/relationships-between-salt-potassium-6609.html
7.http://health.cnhubei.com/djbd/201606/t20160602_101890.html
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