Phosphate Metabolites in Brain of Humans Aged 50+

Inclusion criteria

• Men and women aged between 50 and 75 years
• Healthy, based on the medical screening visit
• Normal BMI for age (18.5-29.9 kg/m2)
• Able to understand and to sign a written informed consent prior to trial entry
• Informed consent signed

Exclusion criteria

• Known type 1 or type 2 diabetes, on anamnesis
• Family history of type 2 diabetes (parents)
• Any other metabolic disease possibly impacting the postprandial glucose and insulin response (on anamnesis, to the opinion of the medical expert)
• Malabsorptive disorders including but not limited to pancreatitis, Crohn's disease, etc, to the opinion of the medical expert
• Any ongoing medication impacting dietary fat absorption and metabolism like statins, bile acid sequestrants, lipid lowering medications, or fibrates , to the opinion of the medical expert
• Any ongoing medication impacting the postprandial glucose and insulin response (like beta blockers), to the opinion of the medical expert
• Any ongoing medication impacting brain metabolism or function (neuroleptics, antidepressants, anti-epileptics), to the opinion of the medical expert
• Ongoing chemotherapy
• Any food supplement intake (e.g. MCT, ketone salts = Calcium, Sodium, Potassium, Magnesium) or special diet (e.g. ketogenic diet) possibly impacting basal ketone levels, to the opinion of the medical expert.
• Claustrophobia
• Hearing disorders (the participant placed into the MRS tunnel should be able to hear from the operators, for safety purpose)
• Having any metallic, electronic, magnetic, or mechanical implants, devices, or objects, for safety reason linked to magnetic field exposure (MRS):

• Aneurysm clip(s)
• Cardiac pacemaker
• Implanted cardioverter defibrillator (ICD)
• Electronic implant or device
• Magnetically-activated implant or device
• Neurostimulation system
• Spinal cord stimulator
• Cochlear implant or implanted hearing aid
• Insulin or infusion pump
• Implanted drug infusion device, like portacath® for instance
• Any type of prosthesis or implant
• Artificial or prosthetic limb
• Any metallic fragment or foreign body
• Hearing aid
• Other implant
• Subject injured by a metallic object or foreign body
• Allergy to cow milk or soy proteins
• Currently participating or having participated in an investigational trial during the past month
• Subjects not willing and/or not able to comply with scheduled visits and the requirements of the research protocol.
• Subject having a hierarchical link with the investigator or co-investigators.