Effect of Fiber‐Rich Diet and Rope Skipping on Memory, Executive Function, and Gut Microbiota in Young Adults: A Randomized Controlled Trial

Scope To investigate the effects of fiber‐rich diets (FDs), rope skipping (RS), and the combination of these two interventions (fiber‐rich diet with rope skipping [FD‐RS]) on memory, executive function in young adults, and to explore their relationship with gut microbiota. Materials and results The study is a 12‐week parallel‐design randomized controlled trial in which 120 undergraduates (19 ± 1 years) are randomized to FD (fiber ≥ 20 g day −1 ), RS (3 × 2000 times per week), FD‐RS or control group ( n = 30 per group). Memory and executive function are assessed by scales, and stool samples are collected at baseline and after the intervention. FD group and FD‐RS group show fewer prospective and retrospective subjective memory impairments than the control group, but there is no significant difference between FD‐RS and the intervention alone (FD or RS). No obvious change in executive function is observed throughout the trial. In terms of the gut microbiota, the α‐diversity does not increase, but the microbial community evenness improves after the RS and FD intervention. Additionally, the relative abundance of phylum Firmicutes and genera Faecalibacterium, Eubacterium_coprostanoligenes_group in the RS group and NK4A214_group in the FD group significantly increase. In the RS group, a correlation is found between the increase in microbial evenness and the improvement in retrospective memory. Conclusion The FD and FD‐RS have beneficial effects on memory in young adults. Meanwhile, FD and RS can improve the microbial evenness and increase several beneficial genera of phylum Firmicutes .