Determination of the Optimal Nutrient Mix to Acutely Increase Plasma Ketones

Inclusion Criteria: * Aged 60-80 years * Body mass index (BMI) 25-35 kg/m2 * Stable dietary habits (no weight loss or gain \> 5 kg in the past 3 months) * Participants are able to provide signed and dated written informed consent prior to any study specific procedures Exclusion Criteria: * Type 2 diabetes * Pre-diabetes based on one or a combination of the following criteria: * ImpairedFastingGlucose(IFG):Fasting plasma glucose ≥ 6.1mmol/l and ≤ 6.9 mmol/l. * HbA1c of 5.7-6.4%. * Participants with active congestive heart failure and/or severe renal and or liver insufficiency * Uncontrolled hypertension * Alcohol consumption of \> 3 servings per day for man and \> 2 servings per day for woman * Unstable body weight (weight gain or loss \> 5 kg in the last 3 months) * Previous enrolment in a clinical study with an investigational product during the last 3 months or as judged by the investigator which would possibly hamper our study results * Significant food allergies/intolerance (seriously hampering study meals) * Participants who do not want to be informed about unexpected medical findings * Blood donation during or within 2 months prior to the study