A diet high in salt might cause the immune system to age blood vessels, according to research.

New Research Links High Salt Diet to Cardiovascular Aging

For a long time, we’ve known that too much salt can raise blood pressure. But new findings suggest it might do even more—it can mess with your immune system and speed up the aging of blood vessels.

A recent study published in the Journal of the American Heart Association explored how a high-salt diet could trigger a series of biological reactions linked to heart health. Researchers from the University of South Alabama conducted experiments on mice and found that their blood vessel functionality declined sharply when they were fed a salty diet.

In just four weeks, the small arteries that help manage blood flow lost their ability to relax. Interestingly, the cells lining these blood vessels entered a phase called cellular senescence. This isn’t just a fancy term; it means the cells stop dividing and release inflammatory signals that can harm nearby tissues.

To dig deeper, the researchers attempted to harm blood vessel cells directly with salt in a controlled environment. But surprisingly, they didn’t observe any damage to the cells. This leads to a rather intriguing idea: perhaps it isn’t the salt itself that’s the culprit, but rather how the body responds to it.

Excess salt seems to cause the immune system to release a molecule called interleukin-16 (IL-16). This acts as a sort of early warning signal, telling the blood vessel cells to age prematurely.

As these cells grow older, they lose the ability to produce nitric oxide, which is crucial for arterial flexibility.

The researchers then tested a class of experimental drugs known as senolytics, trying to see if they could reverse the damage. They used an anti-cancer drug called navitoclax, which specifically targets aging and dysfunctional cells. Remarkably, this treatment restored blood vessel function to nearly normal levels in the mice that had consumed a high-salt diet.

By eliminating the damaged cells induced by the salt, the drug seemed to help keep the remaining healthy tissue flexible and responsive to blood flow.

That said, this study isn’t without its limitations. The jump from mouse studies to practical human treatments involves quite a few challenges. The safety of senolytic drugs, like navitoclax, is still under scrutiny, as results from previous trials have varied, especially regarding arterial plaque.