β Hydroxybutyrate, A Ketone Body, Potentiates The Antioxidant Defense Via Thioredoxin 1 Upregulation In Cardiomyocytes

This study investigated how beta-hydroxybutyrate (βHB), a ketone body produced when your body burns fat for fuel, might protect heart cells from oxidative stress and damage. Ketones like βHB are naturally produced during fasting, low-carb diets, or ketogenic eating patterns, and they serve as an alternative energy source when glucose is limited.

The researchers found that βHB does more than just provide energy to heart cells. It actually strengthens the heart's built-in antioxidant defense system by increasing levels of a protective protein called thioredoxin 1 (Trx1). This protein acts like a cellular bodyguard, neutralizing harmful free radicals that can damage heart tissue. When the scientists exposed heart cells to hydrogen peroxide (a damaging oxidative stress), those treated with βHB survived much better than untreated cells.

The study revealed that βHB works by inhibiting an enzyme called HDAC1, which normally breaks down protective proteins. By blocking this enzyme, βHB allows more Trx1 to accumulate and stay active longer, essentially upgrading the heart's antioxidant defense system. The researchers confirmed these effects both in isolated heart cells and in mice fed a ketogenic diet.

This research suggests that the heart-protective benefits of ketogenic diets and intermittent fasting may extend beyond weight loss and metabolic improvements. The natural production of ketones like βHB during these metabolic states could provide additional cardiovascular protection through enhanced antioxidant defenses, which is particularly relevant for metabolic health and healthy aging strategies.