The overall goals of this work are: 1) to investigate the metabolic and other physical and psychological health effects of the single or combined use of daily HN001 probiotic and cereal enriched with 4 g β-glucan for 6 months in adults with pre-diabetes and the persistence of any health effects for a further 3 months after stopping the interventions; 2) to ascertain the acceptability of the study interventions, how they are adopted into participant’s lives, and develop a pathway to implementation; and 3) to establish the cost effectiveness of the intervention at the population level. Here, PPIB is linked to diabetes mellitus.