Hearing loss affects approximately 48 million Americans. Some evidence suggests that diet may influence risk of hearing loss. Previous studies have looked at how specific nutrients affect risk, but the relation of overall diet and risk of developing hearing loss was unclear. In a new study, researchers from Brigham and Women's Hospital examined the relation between three different diets and risk of developing hearing loss: The Alternate Mediterranean diet (AMED), Dietary Approaches to Stop Hypertension (DASH), and the Alternative Healthy Eating Index-2010 (AHEI-2010) in 70,966 women in the Nurses' Health Study II who were followed for 22 years, and found that eating a healthy diet is associated with a lower risk of acquired hearing loss in women. Results are published in the Journal of Nutrition on May 11.

"Interestingly, we observed that those following an overall healthy diet had a lower risk of moderate or worse hearing loss," said Sharon Curhan, MD, an epidemiologist in the Channing Division of Network Medicine at BWH, and first author of the study. "Eating well contributes to overall good health, and it may also be helpful in reducing the risk of hearing loss."

In this longitudinal study, researchers collected detailed information on dietary intake every four years and found that women whose diets most closely resembled the AMED or DASH dietary patterns had an approximately 30 percent lower risk of moderate or worse hearing loss, compared with women whose diets resembled these dietary patterns the least. Moreover, findings in a sub-cohort of over 33,000 women for whom detailed hearing-related information had been collected suggest that the magnitude of the reduced risk may be even greater than 30 percent, and may also pertain to the AHEI-2010. The AMED diet includes extra virgin olive oil, grains, legumes, vegetables, fruits, nuts, fish and moderate intake of alcohol. The DASH diet is high in fruits and vegetables and low-fat dairy, and low in sodium. The AHEI-2010 diet has common components with AMED and DASH.

Assessment of hearing loss was based on self-report. Researchers say further research in additional populations is warranted.

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