According to American Heart Association:keep it under 1500mg
http://www.heart.org/HEARTORG/Gettin...90_Article.jsp
According to CDC (Center for DiseaseControl) also 1500 to MAX of 2300
http://www.cdc.gov/features/dssodium/
From above link:
The 1,500 recommendation applies to about half of the U.S. population overall and the majority of adults. Nearly everyone benefits from reduced sodium consumption.
•The Adequate Intake (AI) of 1500 mg per day is the recommended average daily sodium intake level. The IOM set the AI for sodium for adults at 1500 mg per day to ensure that the overall diet provides sufficient amounts of other nutrients and to cover sodium sweat losses in physically active individuals.
•The Upper Limit (UL) of 2300 mg per day refers to the highest daily level of sodium that is likely to pose no risk of adverse health effects to almost all individuals in the general population. The UL is not a recommended intake and there is no apparent benefit to consuming levels of sodium above the Adequate Intake (AI).
•The average daily sodium intake for Americans age 2 years and older is 3,436 mg.
•Since the 1970s, the amount of sodium in our food has increased, and we are eating more food each day than in the past.