Effect of Mediterranean Diet and Probiotics in Adults With Mild Cognitive Impairment

Inclusion Criteria: * Age\> = 60 years with mild cognitive impairment (Clinical Dementia Rating (CRD) 0.5; Mini Mental Examiantion de Folstein (MMSE)\> 23; Repeatable Battery for the Asessment of Neuropsychological Status (RBANS) \<= 85) * Drugs with a stable dose from a minimum of 4 weeks prior to screening (excluding psychopharmaceuticals and any other that could affect alertness and cognitive ability) * Geriatric depression scale score \<6 * Sufficient visual and auditory abilities to carry out the neuropsychological tests. Good health without diseases that prevent the completion of the study. * A minimum educational training established for 6 years or similar work history. * A familiar informant or close caregiver with a minimum contact with the patient established in 10 hours per week that can accompany the participant to the clinical visits Exclusion Criteria: * Any uncontrolled medical or neurological condition that, in the opinion of the researcher, could contribute to the subject's cognitive impairment (for example, substances abuse, vitamin B12 deficiency, abnormal thyroid function, stroke, or other Cerebral vascular disease, Lewy body dementia, frontotemporal dementia, TBI). * A clinically significant psychiatric illness (eg, major depression, schizophrenia, or bipolar affective disorder) in the 6 months prior to screening. * Transient ischemic attack or cerebrovascular accident or any unexplained loss of consciousness in 1 year before selection (in case of vascular deficit with cognitive sequelae that may still be reversible). * Poorly controlled diabetes mellitus, due to a glycosylated haemoglobin (HbA1c) value of 8% in the selection. * History of unstable angina, myocardial infarction, chronic heart failure (New York Heart Association Class 3 or 4), or clinically significant conduction disorders (unstable atrial fibrillation) within 1 year prior to screening. * Uncontrolled hypertension defined as the mean of 3 measures of systolic blood pressure / diastolic blood pressure\> 165/100 mmHg, and persistent systolic blood pressure / diastolic blood pressure \> 180/100 mmHg in the 3 months prior to randomization which were considered by the researcher as an indicative of chronic uncontrolled hypertension. * History of seizures in the 10 years prior the selection. * Recent history (within 1 year of screening) of alcohol or substance abuse with positive urine test (looking for non-prescription drugs), alcohol or cannabinoids. * Patients with chronic diseases will be excluded: severe psychiatric, chronic processes in need of treatment such as chronic kidney failure, chronic liver disease, neoplasms under treatment, chronic obstructive pulmonary disease, endocrinopathies susceptible to decompensation and digestive tract diseases.