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The Stiff-Heart Switch: Urolithin A and Heart Failure (HFpEF) Ep. 1314 OCT 26

Why do millions of hearts pump normally yet still leave people breathless? In heart failure with preserved ejection fraction (HFpEF, said "heff-peff"), the heart squeezes fine but is too stiff to relax and refill. It affects an estimated 20 million-plus people worldwide and is hard to spot and hard to treat.

A new study from King's College London found a hidden relaxation switch inside heart muscle, an enzyme called PKGIα with one tiny chemical handle (cysteine 42). Urolithin A, a molecule gut bacteria make from pomegranates, walnuts and berries, grabbed that handle and loosened stiff hearts in mice, improving filling, scarring and running distance. In mice bred without the handle, it did nothing. Lab-grown human heart tissue also relaxed faster.

What it is not: a treatment. This was male mice for one week plus lab tissue, using purified urolithin A at doses above anything food provides. We translate the mouse dose into human terms and walk through what would still need to be proven in people.

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