Investigation of Acute Mood and Cognitive Performance Effects of Beverages Containing Phenolics in Healthy Adults

Inclusion Criteria: * Aged 18 to 49 years * Self-report of good health * Are not excluded on the basis of the following exclusion criteria Exclusion Criteria: * Are a smoker * Have food allergies or sensitivities to any of the ingredients contained in the investigational product or any other foodstuff * Currently take medication except the contraceptive pill * Have habitually used dietary supplements within the last month (defined as more than 3 consecutive days or 4 days in total) * Have sleep disturbances and/or are taking sleep aid medication Are employed in a job that includes night shift work * Have a Body Mass Index (BMI) outside of the range 18-35 kg/m2or weigh less than 50kg or more than 85kg. * Have high blood pressure (systolic over 139 mm Hg or diastolic over 89 mm Hg) * Have a history of neurological, vascular or psychiatric illness including epilepsy or seizures (excluding depressive illness and anxiety) * Have a history of anxiety or a current diagnosis of anxiety or depression * Are pregnant, trying to get pregnant or breast feeding * Have a recent history of (within 12 months of screening visit) or strong potential for alcohol or substance abuse. Alcohol abuse is defined as more than 60g (men) / 40g (women) pure alcohol per day (7 / 5.5 units) * Have learning difficulties or dyslexia * Have visual impairment that cannot be corrected with glasses or contact lenses * Have frequent migraines that require medication (more than or equal to 1 per month) * Have disorders of the blood (e.g. anaemia, hemophilia, thrombocytosis) * Have a heart disorder or a history of vascular illness * Have a respiratory disorder that requires regular medication (Note: participants with asthma who only take their medication occasionally/as required are eligible for this study) * Have a diagnosis of type I or type II diabetes * Have a history of renal or hepatic disease, or other severe diseases of the gastrointestinal tract (e.g. iron accumulation, iron utilization disorders, hypercalcaemia, hypercalciuria), that are likely to interfere with metabolism/absorption/secretion of the product under investigation * Have any health condition that would prevent fulfillment of the study requirements * Are currently or have in the past 8weeks participated in other clinical or nutrition intervention studies * Have participated in the BPNRC's recent stress study * Do not have a bank account (required for payment)