Tea Components, Mental Stress and Blood Pressure

Inclusion Criteria: * Apparently healthy males and females * Women taking the contraceptive pill * 18-45 years of age * BMI 20-30 kg/m2 * Normal or corrected vision * Low caffeine consumers (\<100mg/day) * Non smokers and having been a non-smoker for \> 6 months * Fluent English * Normotensive (\>90/60 \<140/90 mmHg) Exclusion Criteria: * Significant current or medical history of cardiovascular disease * Low or high STAI trait score in the opinion of the PI * Known sensitivity to caffeine or theanine * Colour blindness * Alcohol consumption above 14/21 units female/male resp. per week * Weight loss diet \> 10% of bodyweight in the previous year * Anyone with a dependency on PI or staff of Department of Epidemiology and Public Health or being an employee of Unilever * Reported participation in another biomedical study \< 3 months before screening