Visit 2. Visit 2 will require the participant to fast over night from 10pm. Only water will be admissible from this time. The following morning participants will arrive at the laboratory in a fully hydrated and rested state at ~ 7.30am. This visit will take ~ 5 hours and will require 4 MRI scans. Participants will have the first MRI scan after a short acclimatisation period. Participants will then be provided with a concentrated 140 mL nitrate drink or placebo with a standardised breakfast (2 slices of toast with butter). Three subsequent MRI scans will be required (one per hour for three hours). Venous blood samples taken from cannulas will be sampled, in order to assess glucose, insulin, incretins and nitrate/nitrite prior to each scan. Visit 3. Visit 3 will take place after a minimum washout period of 7 days from Visit 2. Visit 3 will be identical in nature to visit 2; however, it will be with the opposite supplement (either nitrate rich or placebo beetroot juice).