The acute effect of cocoa and red-berries on visual acuity and cone-mediated dark adaptation in healthy eyes

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Puell Marín, María Cinta and Pascual-Teresa, Sonia de (2021) The acute effect of cocoa and red-berries on visual acuity and cone-mediated dark adaptation in healthy eyes. Journal of functional foods, 81 (104435). 7 p.. ISSN 1756-4646

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Official URL: https://doi.org/10.1016/j.jff.2021.104435




Abstract

The retina is a highly vascularized tissue with a high metabolic and oxygen demand responsible for human vision. Considering that the polyphenolic flavanols and anthocyanins have been shown to be beneficial for endothelial function and cerebral blood-flow, an acute randomized and controlled crossover trial with two different sources of polyphenols, anthocyanins from red-berries and flavanols from cocoa, was designed to better understand the effect of polyphenols on visual acuity (VA) and cone-mediated dark adaptation (DA). Thirty-seven healthy subjects (22.1 ± 2.0 years old) participated in the acute intervention for three times (red-berries, cocoa or vehicle-control) with a washout period of two weeks in-between. VA under photopic and low luminance (mesopic) conditions, DA or dynamic of recovery of contrast threshold (CT) following near-total photopigment bleach for 5 min, urine total polyphenols, theobromine and antioxidant power were measured in the three study-arms after 2-hours ingestion of the study-food. 3-hours postprandial urine showed higher levels of total polyphenols after ingestion of cocoa flavanols or red-berries anthocyanins in comparison with the vehicle-control and higher levels of theobromine only for the cocoa group. There was an increase in photopic VA with cocoa flavanols that with red-berries anthocyanins did not reach statistical significance. Both, cocoa and red berries, failed to improve mesopic VA and the cone time constant for contrast recovery and final CT of DA.


Item Type:Article
Additional Information:

Received 3 November 2020, Revised 25 February 2021, Accepted 10 March 2021, Available online 10 April 2021.

Uncontrolled Keywords:Polyphenols; Flavanols; Anthocyanins; Vision; Human vision; Health; Theobromine
Subjects:Medical sciences > Medicine > Dietetics and Nutrition
Medical sciences > Optics > Optometry
Medical sciences > Optics > Eyes anatomy
ID Code:64981
Deposited On:22 Apr 2021 14:56
Last Modified:23 Apr 2021 07:46

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