Electrolyte Osmolarity for Fasting

The Natriuresis of Fasting

When you stop eating carbs, insulin levels drop significantly. Insulin signals the kidneys to retain sodium. When insulin drops, the kidneys rapidly dump sodium into the urine (Natriuresis). Water follows the sodium. This is why you lose "water weight" quickly—but it causes headaches, fatigue, and dizziness.

The Sodium Fear

Most people fear salt. During fasting, salt is your lifeline. Without adequate sodium, your blood volume drops (hypovolemia), causing your heart rate to spike (orthostatic hypotension). You do not need sugar; you need salt.