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Hormonal correlates of weight loss associated with blood pressure reduction.

This study investigated changes in plasma norepinephrine and the renin-angiotensin-aldosterone system during weight loss. Subjects were maintained on a hypocaloric and low sodium diet for 12 weeks. During weight loss statistically significant decreases in blood pressure, aldosterone, plasma renin activity, and norepinephrine were evident. Plasma renin substrate was suppressed from week one to eight and returned to control levels by week twelve. The data indicate that a reduction in the activity of the renin-angiotensin-aldosterone system, modulated by circulating norepinephrine and plasma renin substrate, may significantly contribute to the fall in blood pressure associated with weight loss.