Foo, WL, Harrison, JD, Mhizha, FT, Langan-Evans, C, Morton, JP, Pugh, JN and Areta, JL (2022) A short-term low fibre diet reduces body mass in healthy young men: implications for weight sensitive sports. International Journal of Sport Nutrition and Exercise Metabolism. pp. 1-9. ISSN 1526-484X

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Abstract

Athletes from weight-sensitive sports are reported to consume low-fiber diets (LOW) to induce acute reductions in body mass (BM). However, evidence supporting their efficacy is anecdotal. Therefore, we aimed to determine the effect of a LOW on acute changes in BM. Nineteen healthy males (32 ± 10 years, 1.79 ± 0.07 m, 77.5 ± 8.1 kg) consumed their habitual diet (∼30 g fiber/day) for 7 consecutive days followed by 4 days of a LOW (<10 g fiber/day) that was matched for energy and macronutrient content. Participants also matched their daily exercise load during LOW to that completed during habitual diet (p = .669, average 257 ± 141 arbitrary units). BM was significantly reduced in LOW versus habitual diet after 4 days (Δ = 0.40 ± 0.77 kg or 0.49% ± 0.91%, p < .05, effect size [ES] [95% confidence interval] = −0.53 [−1.17, 0.12]) and on the morning of Day 5 (Δ = 0.58 ± 0.83 kg or 0.74% ± 0.99%, p < .01, ES = −0.69 [−1.34, −0.03]). LOW resulted in moderately higher hunger (Δ = 5 ± 9 mm, p = .015, ES = 0.55 [−0.09, 1.20]), a decline in stool frequency from 2 ± 0 to 1 ± 0 bowel movements per day (p = .012, ES = 0.64 [−0.02, 1.29]) and stool softness decrease (p = .005). Nonetheless, participants reported the diet to be tolerable (n = 18/19) and were willing to repeat it (n = 16/19). Data demonstrate for the first time that consumption of a short-term LOW induces reductions in BM.

Item Type:	Article
Additional Information:	Manuscript has been published online as Ahead of Print: Accepted author manuscript version reprinted, by permission, from International Journal of Sport Nutrition and Exercise Metabolism, 2022, https://doi.org/10.1123/ijsnem.2021-0324. © Human Kinetics, Inc.
Uncontrolled Keywords:	1106 Human Movement and Sports Sciences, 1116 Medical Physiology
Subjects:	T Technology > TX Home economics > TX341 Nutrition. Foods and food supply R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions:	Sport & Exercise Sciences
Publisher:	Human Kinetics
Date Deposited:	14 Feb 2022 11:57
Last Modified:	21 Mar 2022 15:15
URI:	https://researchonline.ljmu.ac.uk/id/eprint/16285

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