At 12:36 h, the participant will be served a standardised lunch (sandwich x 2 slices thick bread 40 grams carbohydrates, yogurt 14-16 grams carbohydrates, crisps 25 gram multipack bag 13-15 grams carbohydrates) during that sitting period. At the end of the intervention the intravenous catheter will be removed by clinicians (two clinical teaching fellows). A standardised dinner (sandwich x 2 slices thick bread 40 grams carbohydrates, yogurt 14-16 grams carbohydrates, crisps 25 gram multipack bag 13-15 grams carbohydrates) will also be provided, and participants will be instructed to have this dinner at 17:00 h at home. Participants will be instructed to avoid having any other food on that day apart from the standardised dinner provided.