High sodium means high water retention. This really happens when you are dehydrated. If you are dehydrated and your sodium intake is high, it can actually cause you to gain weight in addition to many other ailments such as high blood pressure. High sodium intake can also elevate cholesterol levels. I recommend staying away from table salt altogether and using natural salt like sea salt. Also avoid adding additional sodium to foods. When possible, eat plain. Keep sodium low to prevent excess water retention and weight gain.