Fiber Blends and Gut Microbiota (FB)

Inclusion Criteria: * BMI ≥25.0 and ≤35.0 kg/m2 * ≥18 and ≤60 years Exclusion Criteria: * previous bariatric surgery * significant organ system dysfunction (e.g., diabetes, severe pulmonary, kidney, liver or cardiovascular disease) * cancer or cancer that has been in remission for \<5 years * major psychiatric illness * inflammatory gastrointestinal disease * pregnant or lactating women * use of medications that are known to affect the study outcome measures and that cannot be temporarily discontinued for this study * use of medications known to affect the composition of the gut microbiota within the last 30 days (most notably antibiotics) * bowel movements \<3 times per week * vegans, vegetarians, those with lactose intolerance and/or severe allergies/aversions/sensitivities to foods and ingredients included in the prescribed meal plan * persons who are not able to grant voluntary informed consent * persons who are unable or unwilling to follow the study protocol or who, for any reason, the research team considers not an appropriate candidate for this study, including non-compliance with screening appointments or study visits.