Effect of a Fermented Dairy Protein With Prebiotic Fiber on GI Complaints

Aside from having participants fitting the inclusion and exclusion criteria below, potential participants will be screened using the gastrointestinal symptom rating scale (GSRS). Based on the outcome they will be assigned to the Part I (i.e. no self-reported GI tract issues (GSRS questionnaire score GI complaints, based on GSRS screening with all items scored \<4 (severe) and a total GSRS score ≤25), or Part II (i.e. Severe self-reported GI tract issues (GSRS questionnaire score GI complaints, based on GSRS screening with at least one item scored ≥4 (severe) and a total GSRS score ≥30). If they don't fit these criteria (i.e., having a GSRS score ranging from 26-29) they will be excluded from participation. Inclusion Criteria: * Healthy subjects living in the Phoenix area in AZ, USA during the study * Women/Men aged between 18-50 years (50-50%) * Recreational competitive and non-competitive athletes (exercise at least 2x per week with a minimal total duration of 2 hours/week) * BMI value between ≥18.5 and ≤ 30 kg/m2 * No physical limitations due to an injury (i.e., able to perform all activities associated with daily living and exercise in an independent manner). * Willing to slightly increase their energy intake via a supplement during the study period on daily basis in the morning before breakfast. * Willing and comfortable to perform multiple physical (stress) tests on a treadmill during the study. * Participants without any contraindications when scoring the Physical Act…