Can hearing aids also slow memory decline?

What the trial compared

The ACHIEVE study recruited people aged 70 to 84 with untreated hearing loss and without substantial cognitive impairment. Half were randomly assigned to receive audiological counselling and hearing aids. The other half received individual health-education sessions about chronic disease prevention. Everyone was followed every six months for three years. The study measured change in a combined thinking and memory score from a comprehensive set of cognitive tests, rather than tracking dementia diagnoses directly.

What happened to thinking and memory over three years

In the main analysis, the hearing and health-education groups showed almost no difference in three-year cognitive change. Both groups lost a similar small amount on the cognitive score, so the hearing intervention did not clearly reduce cognitive decline in the overall trial population. This similarity does not prove that hearing support has no cognitive effect; it only shows no clear advantage across everyone in this trial. No significant adverse events were attributed to either study programme.

Why a higher-risk group was examined separately

The participants came from two different backgrounds. Some were already part of a long-standing heart-health study, and they tended to be older, had more risk factors for cognitive decline, and started with lower cognitive scores. The trial also recruited generally healthier volunteers from the community. Because these groups were so different, the researchers planned in advance to examine them separately. That comparison showed the hearing intervention appeared to help in the higher-risk group, while no similar benefit appeared among the healthier volunteers. This fits the idea that hearing support might reduce cognitive change over three years for people already at increased risk, but not for people at lower risk.

What to keep in mind

The higher-risk finding is a supportive subgroup signal, not a standalone proof, and it sits alongside the overall neutral result. The trial was unmasked, so participants knew whether they received hearing aids or health education. Most participants were White, so the results may not extend equally to more diverse groups. The central finding remains that the hearing intervention did not clearly slow cognitive change in the whole trial population, while possible benefit in higher-risk people needs further confirmation.