Paper
Two Week Keratin-Based Protein Supplementation is Comparable in Gastrointestinal Handling to a Milk-Based
Published Jan 1, 2014 · C. Starck, S. Stannard
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Abstract
Purpose: Keratins are fibrous, structural, animal-based proteins with emerging potential as a supplement for humans. Naturally high levels of the sulfur amino-acid cysteine suggest that keratin ingestion could augment antioxidant status and provide benefit for healthy and diseased populations. Although keratins have long been present in the human diet, scientific confirmation of gastrointestinal and metabolic acceptability during daily keratin intake representing a significant proportion of daily minimum recommended protein intake is required. Methods: In a blind cross-over study, questionnaire based assessment of gastrointestinal health and palatability was undertaken every 3 days during 14 days of daily consumption of either casein or a keratin based bar and drink powder. Ingestion rate began at 10 g∙d -1 of target protein and increased by 10 g every 3 days ending with 5 days at 40 g∙d -1 . Results: Keratin ingestion raised the prevalence of increased flatulence and change in flatulent odor compared to the casein control. No other negative trends in gastrointestinal health or dose response were observed within or between the two treatments.Conclusions: The keratin-based protein supplementation up to 40 g∙d-1 for 5 days did not cause any acute gastrointestinal disturbance unrelated to
Keratin-based protein supplementation up to 40 gd-1 for 5 days did not cause acute gastrointestinal disturbance unrelated to flatulence compared to milk-based protein.
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