The standard meal will be a portion controlled gluten-free meal provided and delivered by Wiltshire Farm Foods consisting of a meat-based main course and dessert. These will be kept frozen until used by participants and prepared according to manufacturer instructions. These meals come in two sizes which allow portion sizes to be adjusted for different ages of child, but the proportions of fat, protein and carbohydrate will be kept constant for each child, and by definition the meals will be high in protein and high in fat.