Volunteer recruitment
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Nine healthy volunteers (four men and five women, age 54·1 ± 16·9, BMI: 25·6 ± 2·0 kg/mProspective volunteers who registered an interest in the study signed the consent form and attended a screening visit at the Human Nutrition Unit (HNU) at the Rowett Institute. The volunteers completed a general health questionnaire, and their height and weight were measured in the fasted state. A fasting blood sample was also collected to assess glucose 6 phosphate dehydrogenase deficiency deficiency, performed at Aberdeen Royal Infirmary Hospital in Foresterhill. Eligible volunteers participated in two randomised cross-over intervention visits to the HNU, each lasting 3 days and separated by a minimum washout period of 1 week.