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Experimental Gerontology
Volume 194, September 2024, 112510
The effects of time restricted feeding on age-related changes in the mouse retina


https://doi.org/10.1016/j.exger.2024.112510

Highlights
•Time-restricted feeding is a dietary intervention in which feeding time but not food quantity is restricted.

•Time-restricted feeding is of interest as a dietary modification for promoting healthy aging.

•Time-restricted feeding reduces age-related declines in retinal function.

•Time-restricted feeding does not alter age-related signs of retinal inflammation.

Abstract
Dietary modifications such as caloric restriction (CR) and intermittent fasting (IF) have gained popularity due to their proven health benefits in aged populations. In time restricted feeding (TRF), a form of intermittent fasting, the amount of time for food intake is regulated without restricting the caloric intake. TRF is beneficial for the central nervous system to support brain health in the context of aging. Therefore, we here ask whether TRF also exerts beneficial effects in the aged retina. We compared aged mice (24 months) on a TRF paradigm (access to food for six hours per day) for either 6 or 12 months against young control mice (8 months) and aged control mice on an ad libitum diet. We examined changes in the retina at the functional (electroretinography), structural (histology and fluorescein angiograms) and molecular (gene expression) level. TRF treatment showed amelioration of age-related reductions in both scotopic and photopic b-wave amplitudes suggesting benefits for retinal interneuron signaling. TRF did not affect age-related signs of retinal inflammation or microglial activation at either the molecular or histological level. Our data indicate that TRF helps preserve some aspects of retinal function that are decreased with aging, adding to our understanding of the health benefits that altered feeding patterns may confer.