Insulin tells your kidneys to keep more salt in your body, even if you didn't eat extra salt.

Insulin resistance results in chronically elevated insulin levels, causing the kidneys to continuously retain sodium due to persistent hormonal signaling.

When there’s too much insulin in the body, it messes with a signal that usually tells the kidneys to let go of salt, so the kidneys hold onto more salt instead — which might raise blood pressure.

Elevated uric acid levels directly increase renal sodium reabsorption without insulin involvement.