Mobile 'App' to Improve Iron and Zinc Intake, Iron and Zinc Status, Cognition, Mood and Fatigue in Premenopausal Women

Participants will take part in a 16-week three-arm randomised controlled trial (RCT). Apart from a healthy eating control group, there are two arms involving intervention, including the dietary group and the supplement group. All the participants in the RCT will have different mobile phone app(s) installed in their phones, according to which group they are randomly allocated to. Participants in the intervention group will receive a mobile phone app with an online component that contains fact sheets and quizzes about dietary iron and zinc, and encourages dietary habits that may maximise iron and zinc absorption through a goal system. The goal system encourages participants to 1) eat two iron-fortified products each day, 2) eat 50 mg of vitamin C with meals, 3) use a point system where foods are assigned points depending on iron content, consume at least 12 points per day, and 4) drink coffee/tea away from meals. Participants in the supplement group will be provided a supplement of 65.7 mg elemental iron daily for the duration for the 16 weeks of the study. The supplement will be taken orally as a film coated tablet. The participants will receive regular reminders of iron supplement intake and dietary advice for a "healthy diet" through mobile phone apps. There will be two apps involved for the supplement group. One app has an online component and contains fact sheets, reminder and a goal system encouraging participants to: 1) limit intake of saturated fat, 2) choose wholegrain foods, 3) reduce sodium intake, and 4) aim to eat 2 serves of fruit and 5 serves of vegetables daily. The second app is the publically available FoodSwitch app developed by Bupa and the George Institute which participants are encouraged to use when shopping for food.