Data from: "Distinct modulatory effects of high-fiber and fermented-food diets on gut microbiota, immune function, transit time, and sleep quality in a citizen science randomized controlled trial"

This study is an randomised controlled trial (RCT) with three intervention groups: high dietary fiber group (HDF), high fermented foods group (HFF), and a control group (CG). The total duration of the study is 5 months and consists of an 8-week intervention (2-week ramp up period with dietary guidelines, followed by 6-week period with dietary guidelines + additional consumption of study products) and a follow-up after 3 months. Data is collected at 3 time-points: week -1 (baseline), week 2 (end ramp-up) and week 8 (end intervention).The study is conducted in two starting groups. The first group consisted of 34 participants (start June 2023) and the second group of 113 participants (start September 2023).