Opting for a high-salt diet can not only be problematic for one's blood pressure, but also for the immune system, suggests a recent study. The research was conducted on mice that were fed a high-salt diet. Later, they were found to suffer from much more severe bacterial infections. Human volunteers who consumed an additional six grams of salt per day showed pronounced immune deficiencies. The World Health Organization (WHO) has recommended a maximum amount of five grams of salt a day. Sodium chloride also appears to have a negative effect on the human immune system. In human volunteers, excessive salt intake also resulted in increased glucocorticoid levels.