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.

据报道，来自体重敏感运动的运动员食用低纤维饮食 (LOW) 会导致体重 (BM) 急剧下降。然而，支持其功效的证据是轶事。因此，我们旨在确定 LOW 对 BM 急性变化的影响。19 名健康男性（32 ± 10 岁，1.79 ± 0.07 m，77.5 ± 8.1 kg）连续 7 天食用他们的习惯性饮食（~30 g 纤维/天），然后是 4 天的 LOW（<10 g 纤维/天）这与能量和常量营养素含量相匹配。参与者还将他们在 LOW 期间的每日运动负荷与习惯性饮食期间完成的运动负荷相匹配（p  = .669，平均 257 ± 141 个任意单位）。4 天后 LOW 与习惯性饮食相比，BM 显着降低（Δ = 0.40 ± 0.77 kg 或 0.49% ± 0.91%，p < .05，效应大小 [ES] [95% 置信区间] = -0.53 [-1.17, 0.12]）和第 5 天早上（Δ = 0.58 ± 0.83 kg 或 0.74% ± 0.99%，p  < .01 , ES = -0.69 [-1.34, -0.03])。LOW 导致中度更高的饥饿感（Δ = 5 ± 9 mm, p  = .015, ES = 0.55 [-0.09, 1.20]），排便频率从每天 2 ± 0 下降到 1 ± 0 排便（p  = .012, ES = 0.64 [−0.02, 1.29]）和大便柔软度降低（p  = .005）。尽管如此，参与者报告说饮食是可以忍受的（n  = 18/19）并且愿意重复它（n  = 16/19）。数据首次表明，短期 LOW 的消耗会导致 BM 减少。