Objective: The objective of this study was to determine whether the plasma renin activity (PRA) and concentration of aldosterone in the serum measured using the ELISA method represents a suitable measure for evaluating the activity of the renin-angiotensin-aldosterone system (RAAS) overall, and whether those values represent a suitable indicator of table salt intake. Methods: 44 young and healthy subjects participated in the research, 24 women and 20 men. All the subjects were on a low salt diet (LS diet) for a period of 7 days (salt intake around 2,3 g/day), and then on a high salt diet (HS diet) for a period of 7 days (salt intake around 14 g/day), and took part in three study visits. During each study visit (before and after implementation of dietary protocols) the subjects’ anthropometric measurements were taken, arterial pressure and pulse were measured, venous blood and 24h urine samples were obtained for the purpose of assessment of adherence to the dietary protocols and determination of PRA and aldosterone concentration in the serum using the ELISA method. Results: Changes in salt intake did not cause changes in anthropometric parameters, pulse, or the amounts of sodium and potassium in the serum in subjects of both sexes. The LS diet has caused a lowering of arterial pressure in female subjects, while the HS diet caused no significant changes in arterial pressure in subjects of both sexes. Excretion of sodium in 24h urine and the calculated daily salt intake were significantly lower after the LS diet, and elevated after the HS diet in both sexes. The LS diet has significantly increased the PRA, as well as the serum concentration of aldosterone, while the HS diet caused a significant decrease in said parameters. A significant positive correlation was discovered between the PRA and the serum concentration of aldosterone, and a significant negative correlation between the daily table salt intake and the amount of PRA or aldosterone in the serum in subjects of both sexes. Conclusion: There is a definitive positive correlation between PRA and the serum concentration of aldosterone, and a significant negative interdependence between the daily table salt intake and the activity of RAAS in subjects of both sexes. Since the high salt intake inhibited, and the low salt intake increased the activity of RAAS, determination of certain components of RAAS has been established as a suitable indicator of table salt intake in young, healthy subjects of both sexes.