ETASCAN Project: ETAS Project 2

Inclusion Criteria: * Aging between 60-80 years old * Having normal vision and hearing * Having a body mass index between 18.5 and 30 * Having mild to moderate subjective cognitive complaints Exclusion Criteria: * Smoking * Having food allergies * Following restrictive and/or unbalanced diets (Appendix 6: Are you vegetarian or vegan? Yes / No; Are you currently on a weight-reducing or other special diet? Yes/No If 'Yes', please give details.) * Being diagnosed with any psychiatric or neurologic conditions (e.g. schizophrenia, depression, dementia) including eating disorders * Being diagnosed with any cardiometabolic diseases (including type II diabetes and cardiovascular disease), or hypertension or thrombosis related disorders or suffer from thyroid disease * Currently taking anticoagulants, antiplatelet medication, antidepressants, proton-pump inhibitors * Currently consuming prebiotic or probiotic supplements * Continuous antibiotic use for \> 3 days within 1 month prior to enrolment * Continuous use of weight-loss drug for \> 1 month before screening * Having a significant gastrointestinal (GI) condition affecting absorption including (but not limited to) inflammatory bowel disease; total colectomy or bariatric surgery; irritable bowel disease; end stage renal disease; active cancer, or treatment for any cancer, in last 3 years * History of claustrophobia * Fitted with a pacemaker or artificial heart valve * Have active implants, such as cochlear, ocular, or penile implant * Experience of metal fragments e.g. shrapnel in your eyes or any other part of your body * Drug infusion pump installed * Have any surgically implanted metal in any part of your body, other than dental fillings and crowns (e.g. joint replacement or bone re-construction) * Have had any surgery that might have involved metal implants * Current or historical experience of epilepsy * Have stimulators for nerves, brain or bone installed * Have an intrauterine contraceptive device installed (IUD) * Wear transdermal patches containing metal * Wear a filling, crown, dental post (entirely within the tooth) associated with root canal treatment, retainer, bridge or braces * For scanning, would need to remove coloured contact lenses, nail polish and makeup. * Hearing aid wearer * Body piercings that you cannot or will not remove for the scanning session * Have tattoos or permanent makeup