Hearing Loss and Blood Sugar: A Hidden Connection
Everyone knows loud noise can damage your hearing. What fewer people realize is that the tiny blood vessels and nerves inside your ear may also make hearing surprisingly sensitive to your overall metabolic health.
So, what does blood sugar have to do with your hearing, and what could explain the connection? Let’s take a closer look.
What are the Most Common Hearing Loss Causes?
Common causes of hearing loss include aging, repeated exposure to loud noise, genetics, ear injuries, certain medications, and health conditions that can affect the ear or auditory system. Diabetes and high blood pressure may also increase your risk.
While loud noises can damage sensitive structures inside the ear over time, hearing depends on more than the ear itself. The inner ear needs a steady supply of oxygen-rich blood, while healthy nerves carry sound signals to the brain. Changes that affect either system can interfere with how well you hear.
What Does Blood Sugar Have to Do With Hearing Loss?
The connection is stronger than you might expect. A 2025 meta-analysis of more than 100,000 people found clinically significant hearing loss in 53% of people with type 2 diabetes compared with 25% of those without it. Higher HbA1c levels have also been associated with more severe hearing loss.
But the pattern may start before blood sugar reaches the diabetes range. Adults with prediabetes have a 30% higher rate of hearing loss than those with normal blood sugar.
How Can High Blood Sugar Affect Your Hearing?
One leading theory involves microvascular damage. Persistently high blood sugar can damage small blood vessels throughout the body, including the tiny vessels that help supply the inner ear. Diabetes may also affect the nerves and sensory cells involved in hearing. Oxidative stress, which can increase with type 2 diabetes, may play a role as well.
Supporting Hearing Health From Different Angles
Because several processes may contribute to hearing loss, it may be helpful to look at compounds that act on different biological pathways, including glucose metabolism and cellular defenses.
Dihydroberberine for Blood Sugar
Berberine has been studied for its ability to promote healthy glucose metabolism. But it’s poorly absorbed, and higher doses can increase the risk of digestive side effects.
Dihydroberberine offers a more bioavailable alternative that can lead to higher berberine levels at a lower dose. Preclinical research suggests DHB may also help maintain healthy blood sugar levels.
Ergothioneine for Oxidative Stress
High blood sugar can increase oxidative stress, which can damage delicate cells and structures in the cochlea, the part of the inner ear that helps turn sound into signals your brain can understand.
Ergothioneine is an antioxidant found primarily in mushrooms that helps cells defend against oxidative stress. Interestingly, researchers have found its dedicated transporter, OCTN1, in the cochlea, where it helps shuttle ergothioneine into cells. That preclinical research also found that ergothioneine reduced oxidative stress and promoted antioxidant defenses in cochlear cells.
How to Support Your Metabolic and Hearing Health
Eating balanced, nutrient-dense meals, staying active, getting enough sleep, and following your recommended treatment plan can all help maintain healthy blood sugar levels. If you're interested in adding dihydroberberine or ergothioneine, talk with your healthcare provider about whether they make sense for you.
Don’t overlook your hearing, either. Regular check-ins can help you catch changes early, especially if you have diabetes or other risk factors. If you’ve noticed yourself turning up the TV or struggling to follow conversations, consider that your cue to speak up.
Devan Ciccarelli is a NASM-Certified Personal Trainer, Nutrition Coach, and Women's Fitness Specialist who writes on health and lives in Florida with her two kids.
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