Here’s another reason you may want to watch what you eat—it might help prevent hearing loss!
Investigators from Brigham and Women’s Hospital have found that eating a healthy diet may reduce the risk of acquired hearing loss. Using longitudinal data collected in the Nurses’ Health Study II Conservation of Hearing Study (CHEARS), researchers examined three-year changes in hearing sensitivities and found that women whose eating patterns more closely adhered to commonly recommended healthful dietary patterns, such as the Dietary Approaches to Stop Hypertension (DASH) diet, the Alternate Mediterranean (AMED) diet, and the Alternate Healthy Index-2010 (AHEI-2010), had substantially lower risk of decline in hearing sensitivity. The team’s findings were published in the American Journal of Epidemiology.*
These researchers challenged the notion that hearing loss is an inevitable part of growing older. Their research focused on identifying potentially modifiable risk factors, or things that can be changed in diet and lifestyle to prevent hearing loss or delay its progression.
Previous studies have suggested that a higher intake of specific nutrients and certain foods, such as the carotenoids beta-carotene and beta-cryptoxanthin (found in squash, carrots, oranges and other fruits and vegetables), folate (found in legumes, leafy greens, and other foods), long-chain omega-3 fatty acids (found in seafood and fish), were associated with lower risk of self-reported hearing loss. These findings revealed that dietary intake could influence the risk of developing hearing loss, but investigators wanted to further understand the connection between diet and hearing loss by capturing overall dietary patterns and objectively measuring longitudinal changes in hearing sensitivities.
How the Study was Prepared
To do so, the researchers established 19 geographically diverse testing sites across the U.S. and trained teams of licensed audiologists to follow standardized CHEARS methods. The audiologists measured changes in pure-tone hearing thresholds, the lowest volume that a pitch can be detected by the participant in a given ear, over the course of three years. An audiologist presented tones of different frequencies (0.5, 1 and 2 kHz as low-frequencies; at 3 kHz and 4 kHz as mid-frequencies; and at 6 kHz and 8 kHz as higher frequencies) at variable “loudness” levels and participants were asked to indicate when they could just barely hear the tone.
Using over 20 years of dietary intake information that was collected every four years beginning in 1991, the researchers investigated how closely participants’ long-term diets resembled some well-established and currently recommended dietary patterns, such as the DASH diet, the Mediterranean diet, and Alternate Healthy Index-2010 (AHEI-2010). Greater adherence to these dietary patterns has been associated with a number of important health outcomes, including lower risk of heart disease, hypertension, diabetes, stroke and death as well as healthy aging.
Better Diet = Better Hearing Study Results
The researchers found that the odds of a decline in mid-frequency hearing sensitivities were almost 30 percent lower among those whose diets most closely resembled these healthful dietary patterns, compared with women whose diets least resembled the healthful dietary patterns. In the higher frequencies, the odds were up to 25 percent lower.
The researchers concluded the association between diet and hearing sensitivity decline encompassed frequencies that are critical for speech understanding, and they were surprised that so many women demonstrated hearing decline over such a relatively short period of time.
The mean age of the women in the study was 59 years; most of the participants were in their 50s and early 60s. This is a younger age than when many people think about having their hearing checked. After only three years, 19 percent had hearing loss in the low frequencies, 38 percent had hearing loss in the mid-frequencies, and almost half had hearing loss in the higher frequencies. Despite this considerable worsening in their hearing sensitivities, hearing loss among many of these participants would not typically be detected or addressed.
The study included female health care professionals, which enhanced the validity of the health information collected and reduced the variability in educational achievement and socioeconomic status, but the study population was limited to predominantly middle-aged, non-Hispanic white women. The authors noted that further research in additional populations is warranted.
This research also underscores how early hearing loss occurs, and the importance of a comprehensive hearing evaluation to establish a baseline against which subsequent evaluations can be measured that would detect the progression of hearing loss.
Schedule an appointment with a doctoral-level audiologist at Associated Audiologists.
*Sharon G Curhan, Christopher Halpin, Molin Wang, Roland D Eavey, Gary C Curhan. Prospective Study of Dietary Patterns and Hearing Threshold Decline. American Journal of Epidemiology, 2019; DOI: 10.1093/aje/kwz223