Sodium intake and cholesterol levels
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Sodium Intake and Blood Cholesterol: Key Findings
Low Sodium Intake and Increased Cholesterol Levels
Several studies have found that reducing sodium intake can lead to a small but significant increase in blood cholesterol levels. Large systematic reviews and meta-analyses show that when people lower their sodium intake, their total cholesterol and triglyceride levels tend to rise slightly, regardless of whether they have normal or high blood pressure. This effect is consistent across different populations and study durations, with cholesterol increasing by about 2.5–2.9% and triglycerides by 6–7% when sodium is reduced from high to recommended levels 56.
Sodium Intake and Cholesterol in Hypertensive Women
Research focusing on hypertensive women has found an inverse relationship between sodium intake and blood cholesterol. In these studies, women who consumed less sodium had higher cholesterol levels, especially those with excess weight. For hypertensive women without excess weight, sodium intake did not significantly affect cholesterol, but for those with excess weight, lower sodium intake was linked to higher cholesterol 13.
Effects of Sodium Intake in Controlled Diets
A major clinical trial (DASH–Sodium) tested the effects of different sodium levels in both a typical American diet and the DASH diet. The results showed that changing sodium intake within a moderate range (from 50 to 150 mmol/day) did not significantly affect total cholesterol, LDL, HDL, or triglycerides. The only exception was a small increase in the total cholesterol-to-HDL ratio on a typical American diet with lower sodium, but this was not seen on the DASH diet .
High Sodium Intake and Cholesterol: Animal and Population Studies
Animal studies suggest that a high-salt diet can increase cholesterol levels, possibly by activating liver enzymes involved in cholesterol production . However, large population studies in humans have found that adults with higher sodium intake actually had lower serum cholesterol, HDL, and LDL levels, though these findings may be influenced by other dietary and lifestyle factors .
Conclusion
Overall, most evidence suggests that reducing sodium intake can cause a small increase in blood cholesterol and triglyceride levels, especially in people with hypertension or excess weight 1356. However, the effect is generally modest, and the health benefits of lowering blood pressure with reduced sodium may outweigh the small rise in cholesterol for most people. The relationship between sodium and cholesterol is complex and may depend on individual health status, diet, and other factors 247.
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