From 1966-2011, two authors summarized the findings of 57 trials of people (mostly Caucasians) with normal blood pressure. Low-sodium diets resulted in a very slight decline of systolic blood pressure by 1.27mm Hg and diastolic blood pressure by 0.54mm Hg as compared to a high-sodium diet .
In eight trials of blacks, with normal or elevated blood pressure, low sodium intake reduced systolic blood pressure by 6.44mm Hg and diastolic blood pressure by 1.98mm Hg as compared to a high sodium intake. Interestingly, the authors found that there was a significant increase in cholesterol, LDL cholesterol, and triglycerides as well as the hormones rennin, aldosterone, and noradrenaline in the low-sodium diet as compared to the high-sodium diet . These elevated hormones can cause an increase in cardiovascular events. The elevated hormones are the body’s attempt to try to hold onto the little salt that is present in the diet.
A low-salt diet has been promoted as healthier for not only blood pressure but for cardiovascular events (i.e., stroke or heart attack). Eleven trials, which included follow-up from six months to seven years, were reviewed. Researchers found that there was no difference in deaths and cardiovascular events between the low-salt groups and the high-salt groups. Systolic and diastolic blood pressure declined in the low-salt group by only 1.1 and 0.6mm Hg. The authors of this review commented that the miniscule lowering of blood pressure with a low-salt diet did not result in any significant health benefit. They also state, “It is also very hard to keep on a low-salt diet.” 
Dr Brownstein said: “My experience has clearly shown the fallacy of low-salt diets. For the great majority of people a low-salt diet does not work. Their energy level drops and they develop hormonal and immune system imbalances.”
Source: “Salt Your Way To Health”. Author: Dr. Brownstein
1) Ambard, L. Causes de L’hypertensin anerielle. Arch. Gen. De Med. 1904:1:520-33
2) Jurgens, G., et al. Effects of low sodium diet versus high sodium diet on blood pressure, rennin, aldosterone, catecholamines, cholesterols and triglyceride. The Cochrane Database of Systemic Reviews. 2004, Issue 1. Art. No: CD004022.DOI: 10.1002/14651858.CD004022.pub2
3) Jurgens, G. IBID. 2004.
4) Hooper, L., et al. Advice to reduce dietary salt for prevention of cardiovascular disease. The Cochrane Database of Systemic Reviews, 2004.Issue 1. Art. No: CD003556. DOI:10.1002/1461858.CD003656.pub.2