It could help hearing loss due to diabetes so I don't doubt it.
I'd like to see a study that shows improved hearing if you lose weight. I cannot tell if my hearing has gotten better from losing weight. I do have a better score on words with my last test, but that test really isn't accurate as it depends on the Audi's voice.
There's also a link to worse eyesight and diet sodas because of the aspartame they use for fake sugar. Aspartame turns into methanol in your body as it breaks down.