Pre-Sleep Casein Protein Ingestion Does Not Impact Next-Day Appetite, Energy Intake and Metabolism in Older Individuals
1
School of Sport, Exercise and Rehabilitation Science, University of Birmingham, Birmingham B15 2TT, UK
2
Department of Sport and health Sciences, University of Exeter, Exeter EX1 2LU, UK
*
Author to whom correspondence should be addressed.
†
These authors contributed equally to the manuscript.
Nutrients 2020, 12(1), 90; https://doi.org/10.3390/nu12010090
Received: 5 December 2019 / Revised: 21 December 2019 / Accepted: 25 December 2019 / Published: 28 December 2019
(This article belongs to the Special Issue Nutrition for Human Health, Performance and Recovery)
Maintaining adequate daily protein intake is important to maintain muscle mass throughout the lifespan. In this regard, the overnight period has been identified as a window of opportunity to increase protein intake in the elderly. However, it is unknown whether pre-sleep protein intake affects next-morning appetite and, consequently, protein intake. Therefore, the purpose of the current study was to investigate the effects of a pre-sleep protein drink on next-morning appetite, energy intake and metabolism. Twelve older individuals (eight males, four females; age: 71.3 ± 4.2 years) took part in a single-blind randomised cross-over study. After a standardised dinner, participants consumed either a 40-g protein drink, isocaloric maltodextrin drink, or placebo water control before bedtime. Next-morning appetite, energy intake, resting metabolic rate (RMR), respiratory exchange rate (RER), and plasma acylated ghrelin, leptin, glucose, and insulin concentrations were assessed. No between-group differences were observed for appetite and energy intake at breakfast. Furthermore, RMR, RER, and assessed blood markers were not significantly different between any of the treatment groups. Pre-sleep protein intake does not affect next-morning appetite and energy intake and is therefore a viable strategy to increase daily protein intake in an older population.
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Keywords:
pre-sleep protein; sarcopenia; ageing
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MDPI and ACS Style
Morehen, S.; Smeuninx, B.; Perkins, M.; Morgan, P.; Breen, L. Pre-Sleep Casein Protein Ingestion Does Not Impact Next-Day Appetite, Energy Intake and Metabolism in Older Individuals. Nutrients 2020, 12, 90.
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