Research has shown that consuming salt less than the recommended amount (i.e. 2.3 gms/ day) can help in controlling blood pressure.
The study conducted involved 412 people having a blood pressure of 120/80. They were either taking high fat diet or DASH (Dietary Approaches to Stop Hypertension) diet (rich in fruits, vegetables, low-fat dairy products, whole grains, poultry, fish, nuts). During the 30 day study each group was given either 3.5 gms sodium/day or 2.3 gms/day or 1.2 grams/day.
The study showed that the systolic blood pressure of those taking DASH diet and 1.2 gms of sodium/day was 11.5 mm Hg less as compared to those taking high fat diet with 3.5 gms sodium/day.
Hence the study proves that it is best to take low amount of sodium (i.e. 1.2 gms) as compared to the recommended amount (i.e. 2.3 gms) and also that a reduction in salt intake does have a significant effect on blood pressure in persons without hypertension.