Effects Of Dietary Fats on Gut Microbiota Composition and Metabolic Activity in Healthy Adults

Inclusion Criteria: * Adults aged 20-50 years * Body mass index (BMI) between 20 and 30 kg/m² * Generally healthy * Stable body weight (±2 kg) over the past 2 months * Living in the Glasgow area * Non-smoker Exclusion Criteria: * Use of antibiotics within the past 3 months * Current use of medications affecting gut microbiota or cardiometabolic health * Regular use of dietary supplements that may influence study outcomes (e.g. probiotics, prebiotics, vitamins, minerals, fish oil), unless willing to discontinue prior to study start * Presence of chronic gastrointestinal, metabolic, cardiovascular, hepatobiliary, or pancreatic disease * History of major gastrointestinal surgery * Diagnosed diabetes or use of lipid-lowering therapy * Known fat malabsorption disorders * Pregnant or lactating women * Post-menopausal women * Following a restrictive or specific diet (e.g. vegan, ketogenic diet) * Food allergies or intolerances relevant to study interventions (e.g. dairy, coconut) * Recent significant weight change (±2 kg in the past month) * High reliance on ready meals or takeaway foods (\>7 main meals per week) * Participation in another research study that may interfere with this study