The Impact of Acute Trans-resveratrol Administration on Whole Body Metabolism During Cognitive Demand.

Inclusion Criteria: * Participants who were able to give informed consent. * Those who didn't meet any of the exclusion criteria. * Those who took hormonal contraception (e.g. the pill, coil, implant, etc.) were still allowed to participate in the current study. Exclusion Criteria: * Participants who smoke. * Participants below the age of 18 years or above 35 years at the time of giving consent to in role in the current study. * Participants with Body Mass Index outside the range of 18-35 kg/m2. * Participants with blood pressure greater than 140/90 HH/mg. * Participants with a history of neurological, vascular or psychiatric illness (excluding depressive illness and anxiety). * Participants with a current diagnosis of depression and / or anxiety. * Participants with learning difficulties: dyslexia, dyscalculia or colour blindness. * Participants with a visual impairment that cannot be corrected with glasses or contact lenses. * Participants with frequent migraines that require medication (more than or equal to 1 per month). * Participants with disorders of the blood. * Participants with a heart disorder. * Participants with diabetes. * Participants with a respiratory disorder that requires regular medication (Note: asthma sufferers who only take their medication occasionally/as required were eligible for this study). * Participants currently taking any prescription medications. * Participants who have habitually used dietary supplements within the last month (defined as more than 3 consecutive days or 4 days in total). * Participants with any food intolerances/sensitivities. * Participants with 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. * Female participants who are currently pregnant, lactating or seeking to become pregnant.