The Nutrition Science Podcast The Science of Sodium: How Much Do You Really Need?
Aug 6, 2025
Explore the complex role of sodium in our bodies, from its function as a key electrolyte to its impact on nerve conduction and fluid balance. Discover the nuances of sodium intake, including why individual needs can vary significantly. The discussion highlights the health risks of low and high sodium consumption and offers practical tips for personalizing your intake for optimal health.
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Sodium's Core Physiological Roles
- Sodium is an essential electrolyte that regulates fluid balance and nerve conduction in the body.
- It increases water retention and blood volume, which can raise blood pressure when elevated.
Excess Sodium Raises Cardiovascular Risk
- Excess sodium, especially with low potassium, disrupts fluid balance and raises blood pressure and stroke risk.
- Strong evidence links higher sodium intake to higher blood pressure and cardiovascular risk.
Population Thresholds Don't Fit Everyone
- Around 3 grams per day is the population-average threshold where blood pressure and related risks increase.
- Individual sensitivity varies widely, so population averages don't fit everyone.