Participants will be required to attend 3 clinics in total over a period of 8 weeks, and they will be assessed at baseline (Day 0), interim (Week 4) and post intervention (Week 8). Participants will be requested to fast overnight for approximately 8 hours before all clinics. At each clinic, a 30 ml blood sample will be taken and both height (cm) and weight (kg) will be measured. Before the start and the end of the study, participants will be required to keep a 3-day food diary which includes 2 weekdays and 1 weekend day to represent the habitual dietary intake of the participant. Blood samples will be batch analysed at the end of the intervention to assess all biomarkers of iron status and vitamin D metabolism.