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High blood pressure is often attributed to salt intake, but the real issue may be insulin resistance. Healthy kidneys can process and excrete excess salt, but over 90% of people have some level of insulin resistance.
When cells become resistant to insulin, more insulin is required to move blood sugar into cells. This excess insulin causes the kidneys to retain sodium, triggers the fight-or-flight response constricting blood vessels, and blocks nitric oxide, which relaxes blood vessels. These factors increase blood pressure.
Therefore, insulin resistance, not salt, is the primary cause of high blood pressure. To improve blood pressure, focus on metabolic health by prioritizing protein, strength training, walking after meals, and eliminating ultra-processed foods.