Volunteers will collect urine samples 24 hours prior to the 'test' day and a stool sample either the night before or the morning of the test session. They will have fasted blood taken before eating a portion of carrots with bread and butter. Further blood samples will be taken at 0.5, 1, 2, 3, 4, 6, 8 and 24 hours. All urine and all stool samples (after 4 hours) will be collected up to 48 hours after the carrot dose. They volunteers will attend two test sessions and will be randomised to receive high and low doses of carrot. At least a week will separate testing sessions.