The researchers said each day’s diet was correlated with meaningful differences in the subsequent night’s sleep. Body of knowledgeOur primary senses typically decline with age in a specific order, beginning with hearing and vision, followed by taste and smell. Hearing loss often becomes noticeable in the mid-40s, while vision changes are more prominent in the mid-50s. The Audiphone was effective only in conductive hearing loss. Users could improve their hearing up to 30 decibels, equivalent to a soft conversation heard a few feet away in a quiet room.