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Open AccessArticle

The Effect of Whey and Soy Protein Isolates on Cognitive Function in Older Australians with Low Vitamin B12: A Randomised Controlled Crossover Trial

Health & Biosecurity, Commonwealth Scientific and Industrial Research Organisation (CSIRO), 5000 Adelaide, South Australia, Australia
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Nutrients 2019, 11(1), 19; https://doi.org/10.3390/nu11010019
Received: 29 November 2018 / Revised: 17 December 2018 / Accepted: 17 December 2018 / Published: 21 December 2018
(This article belongs to the Special Issue Ageing and Nutrition through Lifespan)
Whey protein isolate (WPI) is high in vitamin B12 and folate. These and other related markers (holotranscobalamin, methylmalonic acid and homocysteine) have been linked with cognitive health. This study explored the efficacy of WPI for improving cognitive function via delivery of vitamin B12. Moderately vitamin B12-deficient participants aged between 45 and 75 years (n = 56) were recruited into this randomised controlled crossover trial. Participants (55% female) consumed 50 g whey (WPI; active) or soy protein isolate (SPI; control) for eight weeks. Following a 16-week washout phase, they consumed the alternative supplement. Consumption of WPI significantly improved active B12 and folate status but did not result in direct improvements in cognitive function. However, there was evidence of improvement in reaction time (p = 0.02) and reasoning speed (p = 0.04) in the SPI condition for females. Additional analyses showed that changes in active B12, HcY and folate measures during WPI treatment correlated with improvements in cognitive function (all p < 0.05). Results indicate that WPI itself did not result in improved cognitive function but some evidence of benefit of SPI for females was found. However, consistent with previous research, we present further evidence of a role for active B12, HcY and folate in supporting cognitive improvement in adults with low B vitamin status. View Full-Text
Keywords: whey protein isolate; dairy; cognitive function; cobalamin; vitamin B12 whey protein isolate; dairy; cognitive function; cobalamin; vitamin B12
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Zajac, I.T.; Herreen, D.; Bastiaans, K.; Dhillon, V.S.; Fenech, M. The Effect of Whey and Soy Protein Isolates on Cognitive Function in Older Australians with Low Vitamin B12: A Randomised Controlled Crossover Trial. Nutrients 2019, 11, 19.

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