Inclusion Criteria:  Community-dwelling (non-institutionalised) participants ≥60 years older A high risk of undernutrition as defined by a Mini Nutritional Assessment -Short Form (MNA-SF) score of 8 - 11 Positive screen for Subjective Cognitive Decline (SCD) Low PROMED diet adherence (Mediterranean Diet Score [MDS] ≤5)  Exclusion Criteria:  Cognitive impairment determined by the Mini Mental State Assessment (MMSE) or Telephone Cognitive Screen (T-CogS) Receiving oral or artificial nutritional support or medical food supplements Taking high dose nutritional supplements (supplements above the Reference Nutrient Intake levels). Dietary restrictions/allergies that limit ability to adhere to study requirements A diagnosis of mild cognitive impairment or dementia Dysphagia Chronic kidney disease Poorly controlled diabetes (HbA1c >8% or diabetes complications) Severe visual or language impairment Self-reported psychiatric problems or significant medical co-morbidities that compromise the ability to take part/limit capacity to consent Excessive alcohol consumption (2-3 units of alcohol/day or most days of the week) Diagnosis of a comorbid condition that may alter performance on cognitive tests, e.g. stroke, head injury, Parkinson's disease, learning disabilities.