Before revision: For instance, the National Research Council found that 500 milligrams of sodium per day (approximately 1,250 milligrams of table salt) is a safe minimum level .
After revision: For instance, the National Research Council said in 1989 that 500 milligrams of sodium per day (approximately 1,250 milligrams of table salt) "might be", based on estimated and assumed obligatory urinary, fecal, and dermal losses a safe minimum level .